Deciphering Text Puzzle
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Questions and Answers

What is the central unit in biology that plays a similar role to an atom in physical sciences?

  • Cell (correct)
  • Molecule
  • Nucleus
  • Protein

Which of the following organisms is NOT mentioned as a unicellular organism in the text?

  • Bacteria
  • Amoeba
  • Yeast
  • Human (correct)

What is the common genetic material shared by all present-day cells?

  • Carbohydrate
  • RNA
  • Protein
  • DNA (correct)

Which type of organisms are composed of collections of cells that function in a coordinated manner?

<p>Plants (A)</p> Signup and view all the answers

Which organelle surrounds all cells mentioned in the text?

<p>Plasma Membrane (D)</p> Signup and view all the answers

How many different kinds of cells are mentioned to exist in the human body according to the text?

<p>200 (B)</p> Signup and view all the answers

What is the main difference between unicellular and multicellular organisms based on the provided information?

<p>Division of labor exists within cells of multicellular organisms. (B)</p> Signup and view all the answers

What is a characteristic of reproduction in unicellular organisms?

<p>The entire organism is consumed during reproduction. (B)</p> Signup and view all the answers

What did Robert Hooke observe in a thin slice of cork that led to his discovery of cells?

<p>Honeycomb-like structure (C)</p> Signup and view all the answers

Which scientist named the small structures he discovered in a cork 'cells'?

<p>Robert Hooke (A)</p> Signup and view all the answers

What is the significance of Robert Hooke's discovery of cells?

<p>Revealed the basic unit of life in living organisms (D)</p> Signup and view all the answers

Which term derives from the Latin word 'cellula' meaning 'a little room'?

<p>Cell (B)</p> Signup and view all the answers

What aspect defines the life span of an individual as short in unicellular organisms?

<p>Reproduction by a single cell (A)</p> Signup and view all the answers

What is a fundamental characteristic of cells in multicellular organisms?

<p>Division of labor exists within cells (A)</p> Signup and view all the answers

What did Robert Hooke name the small structures he observed in a thin slice of cork?

<p>Cells (D)</p> Signup and view all the answers

What does the presence of division of labor among cells in multicellular organisms imply?

<p>Some cells are specialized for specific roles (C)</p> Signup and view all the answers

Which scientist first observed and named the nucleus in plant cells?

<p>Robert Brown (B)</p> Signup and view all the answers

Who proposed the idea that all plants consist of cells?

<p>Jakob Matthias Schleiden (C)</p> Signup and view all the answers

Which scientist stated that all animals and plants are made up of cells independently of Schleiden?

<p>Theodor Schwann (A)</p> Signup and view all the answers

Who established that the nucleus was responsible for storing and transmitting hereditary characters?

<p>Ernst Haeckel (A)</p> Signup and view all the answers

In 1855, which biologist presented the idea that all cells arise from pre-existing cells?

<p>Rudolf Virchow (B)</p> Signup and view all the answers

Who discovered the free-living cells in pond water for the first time in 1674?

<p>Anton von Leeuwenhoek (B)</p> Signup and view all the answers

Which scientist first gave the term 'protoplasm' to the living fluid substance inside a cell?

<p>J.E. Purkinje (D)</p> Signup and view all the answers

Who is credited with establishing the cell theory as part of biology?

<p>Rudolf Virchow (A)</p> Signup and view all the answers

Who discovered and identified sperm cells of multiple species including humans and rabbits?

<p>Anton von Leeuwenhoek (C)</p> Signup and view all the answers

In which year did J.E.Purkinje give the term 'protoplasm' for the living fluid substance inside cells?

<p>1839 (C)</p> Signup and view all the answers

What type of microscopes are used for observing the fine details of very minute objects?

<p>Electron microscopes (B)</p> Signup and view all the answers

What is the magnification power range of light or compound microscopes?

<p>500-2000 times (C)</p> Signup and view all the answers

What is the purpose of the diaphragm in a light microscope?

<p>To illuminate the object/specimen (D)</p> Signup and view all the answers

Which knob on a light microscope is used for rapid and precise focusing of the object?

<p>Upper and large knob for coarse adjustments (B)</p> Signup and view all the answers

What is the function of the condenser in a light microscope?

<p>To control the amount of light reaching the object (A)</p> Signup and view all the answers

Why are compound microscopes called light microscopes?

<p>Because they use sunlight for illumination (D)</p> Signup and view all the answers

What part of a light microscope is responsible for forming a sharp image by focusing properly?

<p>Side knobs (D)</p> Signup and view all the answers

How does a compound microscope achieve high magnification?

<p>By using specialized lenses (C)</p> Signup and view all the answers

What is the function of a reflector in a light microscope?

<p>To illuminate the object/specimen from above (D)</p> Signup and view all the answers

What distinguishes electron microscopes from light microscopes in terms of imaging capabilities?

<p>Electron microscopes use electrons to image objects at higher resolution than light microscopes. (B)</p> Signup and view all the answers

How does an electron microscope differ from a light compound microscope?

<p>It uses electrons for illumination and electromagnets for magnification. (B)</p> Signup and view all the answers

What is essential for the working of an electron microscope?

<p>An internal vacuum (D)</p> Signup and view all the answers

What does an electron microscope help observe that a compound microscope cannot?

<p>Subcellular structures (D)</p> Signup and view all the answers

What is impregnated with metal to enhance contrast in an electron microscope?

<p>The object (A)</p> Signup and view all the answers

What kind of leaf from an onion bulb is used in Activity 1?

<p>Inner fleshy leaf (C)</p> Signup and view all the answers

What should be done to the onion peel before transferring it to a glass slide?

<p>Put a drop of clean water on it (A)</p> Signup and view all the answers

What is used to transfer the onion peel onto the glass slide in Activity 1?

<p>Thin camel hair paint brush (D)</p> Signup and view all the answers

What is necessary to observe the onion peel under a light compound microscope?

<p>$10(5 + 2)$ power objective lens (C)</p> Signup and view all the answers

What is the term used to describe organisms that do not contain any cells in their body organisation?

<p>Non-cellular organisms (A)</p> Signup and view all the answers

Which type of genetic substance is observed in a Prokaryotic cell's nuclear region?

<p>Chromosome (B)</p> Signup and view all the answers

Which type of cells contain membrane-bound nuclei and other cellular organelles according to the text?

<p>Eukaryotic cells (C)</p> Signup and view all the answers

What is the significance of the undefined nuclear region in the cytoplasm of a Prokaryotic cell being called nucleoid?

<p>It lacks a nuclear membrane. (D)</p> Signup and view all the answers

What type of organisms include bacteria, plants, and animals as examples?

<p>Eukaryotes (B)</p> Signup and view all the answers

What distinguishes Eukaryotic cells from Prokaryotic cells in terms of genetic material?

<p>Presence of membrane-bound nuclei (D)</p> Signup and view all the answers

What is the main characteristic that defines Prokaryotic cells according to the text?

<p>&quot;Primitive cells&quot; (B)</p> Signup and view all the answers

Which organelles are absent in Prokaryotic cells but present in Eukaryotic cells?

<p>&quot;Mitochondria&quot; (D)</p> Signup and view all the answers

What is the term used to describe organisms like bacteria that have advanced and complete cells?

<p>&quot;Eukaryotes&quot; (A)</p> Signup and view all the answers

Which type of cells contain plasma membrane, nucleus, DNA, and cellular organelles such as mitochondria?

<p>&quot;Eukaryotic cells&quot; (C)</p> Signup and view all the answers

What is the term used to describe the contents of a living cell, contained within the plasma membrane?

<p>Protoplasm (C)</p> Signup and view all the answers

Which part of a plant body reveals differences in terms of shape, size, and structure among cells?

<p>Leaf peels (D)</p> Signup and view all the answers

In higher organisms, what basic characteristics are shared by all cells?

<p>Plasma membrane, cytoplasm with organelles and a nucleus (D)</p> Signup and view all the answers

What is the function of a gene?

<p>Protein synthesis regulation (D)</p> Signup and view all the answers

Which part of a cell contains red-colored cell sap according to the text?

<p>Cytoplasm (A)</p> Signup and view all the answers

What distinguishes cells of multicellular organisms from unicellular organisms?

<p>Division of labor among cells (B)</p> Signup and view all the answers

Which organelle is usually differentiated into the nucleus and cytoplasm?

<p>Protoplasm (D)</p> Signup and view all the answers

What is a distinguishing feature of Prokaryotic cells according to the text?

<p>Absence of membrane-bound organelles (A)</p> Signup and view all the answers

How does cell division occur in Prokaryotic cells based on the information provided?

<p>By fission or budding (D)</p> Signup and view all the answers

Which organelle is present in Eukaryotic cells but absent in Prokaryotic cells?

<p>Mitochondria (C)</p> Signup and view all the answers

How does the nucleus of Eukaryotic cells differ from that of Prokaryotic cells?

<p>Presence of a nuclear membrane (A)</p> Signup and view all the answers

Which statement accurately describes the genetic material of Prokaryotic cells?

<p>A single chromosome is present (B)</p> Signup and view all the answers

What differentiates the DNA content of the nucleus from that of the nucleoid?

<p>The nucleus has equal DNA content to several DNA molecules. (B)</p> Signup and view all the answers

In terms of size, which statement correctly contrasts the nucleus and the nucleoid?

<p>The nucleus is larger with a double membrane envelope; the nucleoid is smaller and lacks a covering membrane. (D)</p> Signup and view all the answers

Which feature characterizes the DNA in the nucleoid compared to that in the nucleus?

<p>Nucleoid DNA is associated with histone proteins. (B)</p> Signup and view all the answers

What aspect differentiates the presence of a nucleolus in the nucleus from its absence in the nucleoid?

<p>The nucleolus serves as a storage site for RNA in the nucleus. (B)</p> Signup and view all the answers

Which statement accurately reflects the difference in chromatin structure between the nucleus and the nucleoid?

<p>Histones are present in chromatin of one structure but not the other. (D)</p> Signup and view all the answers

What is a distinguishing feature of organelles mentioned in the text?

<p>They are found in Prokaryotic cells. (A)</p> Signup and view all the answers

What is the major difference between organs and organelles?

<p>Internal vs. external location (A)</p> Signup and view all the answers

Which statement accurately describes the relationship between cells and tissues as per the text?

<p>Tissues comprise of cells. (D)</p> Signup and view all the answers

What is an essential characteristic that differentiates organs from organ systems as mentioned in the text?

<p>Formation of tissues (A)</p> Signup and view all the answers

In the context of cells, what could be a common misconception based on the text?

<p>All cells are multicellular in nature. (B)</p> Signup and view all the answers

Based on the information provided, which option correctly describes the relationship between organelles and cells?

<p>Cells are found in all eukaryotic cells. (D)</p> Signup and view all the answers

Which of the following best describes the role of organ systems in an organism based on the text?

<p>'Organ systems are coordinated to form the body of an organism.' (D)</p> Signup and view all the answers

What is the significance of the cardiac muscle cells in the human body?

<p>They contract rapidly, rhythmically and tirelessly (D)</p> Signup and view all the answers

What distinguishes skeletal muscles from other types of muscles in the human body?

<p>Their contraction depends on voluntary control (A)</p> Signup and view all the answers

In a cell, what is the role of lysosomes as mentioned in the text?

<p>Waste substance clearance (D)</p> Signup and view all the answers

What is the main function of ribosomes within a cell according to the text?

<p>Making new material like proteins (A)</p> Signup and view all the answers

What feature distinguishes cardiac muscle cells from skeletal muscle cells?

<p>Fatigue resistance (B)</p> Signup and view all the answers

Which organelle is responsible for synthesizing food such as glucose/starch within a cell?

<p>Chloroplasts (D)</p> Signup and view all the answers

What primarily determines the shape of a eukaryotic cell based on the text?

<p>Functional adaptations (D)</p> Signup and view all the answers

In what type of cells does variable or irregular shape occur according to the text?

<p>White blood cells and leucocytes (A)</p> Signup and view all the answers

Which organelle is mentioned as responsible for maintaining cell shape in unicellular organisms?

<p>Exoskeleton (B)</p> Signup and view all the answers

What type of cells are spherical in circulating blood but can change shape under different conditions based on the text?

<p>Leucocytes (B)</p> Signup and view all the answers

What maintains the shape of cells in multicellular organisms primarily according to the text?

<p>Cell wall rigidity (D)</p> Signup and view all the answers

Which type of cell is not specifically mentioned to have a fixed shape in the text?

<p>Amoeba (A)</p> Signup and view all the answers

What maintains cell shape in unicellular organisms such as Paramecium?

<p>$\text{Plasma membrane}$ (C)</p> Signup and view all the answers

'Branched' is used to describe the shape of which cell type according to the text?

<p>$\text{Chromatophores}$ (A)</p> Signup and view all the answers

What is the size range of eukaryotic cells according to the text?

<p>10 to 100 μm (A)</p> Signup and view all the answers

Which organism mentioned in the text has the largest cell among multicellular plants?

<p>Cycas (A)</p> Signup and view all the answers

What is the size of a typical cell of multicellular organisms mentioned in the text?

<p>20 to 30 μm (A)</p> Signup and view all the answers

What is the length of the 'tail' or axon found in some nerve cells of human beings?

<p>1 m (C)</p> Signup and view all the answers

Which unit of length is used in the CGS system and is equal to one millionth of a metre?

<p>Micrometre (C)</p> Signup and view all the answers

What is the range of prokaryotic cell sizes as mentioned in the text?

<p>0.1 to 5 m/studygear um (A)</p> Signup and view all the answers

How does the size of unicellular organisms compare to that of typical cells in multicellular organisms?

<p>Unicellular organisms are larger than multicellular organisms. (A)</p> Signup and view all the answers

What primarily determines the size of an organism according to the text?

<p>The number of cells present (B)</p> Signup and view all the answers

In a multicellular organism, what factor is usually correlated with the number of cells?

<p>The size of the organism (A)</p> Signup and view all the answers

What major functional region do all cells possess based on the text?

<p>Cell membrane (A)</p> Signup and view all the answers

Which type of cell region lies inside the plasma membrane?

<p>Nucleus (B)</p> Signup and view all the answers

What is the structure responsible for maintaining cell shape in all cells?

<p>Cell wall (B)</p> Signup and view all the answers

What distinguishes the outer boundary structure of a cell?

<p>Cell wall or plasma membrane (A)</p> Signup and view all the answers

What is responsible for enclosing all cells mentioned in the text?

<p>Plasma membrane (D)</p> Signup and view all the answers

What determines the overall size of a eukaryotic cell?

<p>Nucleus-cytoplasm ratio (D)</p> Signup and view all the answers

What is the nature of the plasma membrane as described in the text?

<p>Living and selectively permeable (B)</p> Signup and view all the answers

How thick is the plasma membrane based on the information provided?

<p>7 nm (D)</p> Signup and view all the answers

What technique made it possible to investigate the detailed structure of the plasma membrane?

<p>Electron microscope (C)</p> Signup and view all the answers

In which organelles are most cellular organelles enclosed according to the text?

<p>Golgi apparatus and endoplasmic reticulum (B)</p> Signup and view all the answers

Which organelle is NOT mentioned as being visible under a light microscope in the text?

<p>Mitochondria (A)</p> Signup and view all the answers

What is one of the essential characteristics of the plasma membrane mentioned in the provided information?

<p>'Selectively permeable' property (C)</p> Signup and view all the answers

What type of microscopy made it possible to view the detailed structure of cellular organelles?

<p>'Advanced' electron microscope (A)</p> Signup and view all the answers

What distinguishes the plasma membrane from other cellular organelles based on the text?

<p>Living, delicate, and selectively permeable (A)</p> Signup and view all the answers

What is the primary chemical component of the plasma membrane?

<p>Phospholipids (B)</p> Signup and view all the answers

Which organelle is responsible for the red-colored cell sap in plant cells?

<p>Plastids (A)</p> Signup and view all the answers

Which type of ER is associated with lipid metabolism and lacks ribosomes on its surface?

<p>Smooth ER (D)</p> Signup and view all the answers

Which part of a cell primarily stores water, sugars, ions, and pigments?

<p>Vacuoles (C)</p> Signup and view all the answers

If a cell inclusion is referred to as 'granules,' what category does it fall under?

<p>Smooth ER (D)</p> Signup and view all the answers

What is responsible for the movement of substances from a region of high concentration to a region of low concentration until uniform concentration is achieved?

<p>Diffusion (D)</p> Signup and view all the answers

Which process involves substances of small size diffusing readily through the phospholipid layer of the plasma membrane?

<p>Diffusion (C)</p> Signup and view all the answers

What is the term used to describe the maintenance of a constant internal environment by the cell despite changes outside it?

<p>Homeostasis (A)</p> Signup and view all the answers

Which substances are generally drawn into a cell and include raw materials for metabolism like food, water, salts, and oxygen?

<p>Salts and water (A)</p> Signup and view all the answers

Which physical activity for substance intake involves molecules or ions moving from a region of higher concentration to a region of lower concentration?

<p>Diffusion (B)</p> Signup and view all the answers

What is the term for the selective movement of substances across the plasma membrane that involves diffusion and osmosis?

<p>Selective permeability (B)</p> Signup and view all the answers

Which biological activity performed by the plasma membrane involves the active transport of substances into the cell?

<p>Active transport (D)</p> Signup and view all the answers

What do substances like carbon dioxide, oxygen, and water generally do when they move through the plasma membrane?

<p>Diffuse readily (A)</p> Signup and view all the answers

What is the main function of intrinsic proteins in the plasma membrane according to the fluid mosaic model?

<p>Provide strength to the membrane (A)</p> Signup and view all the answers

Which statement best describes the role of extrinsic proteins in the plasma membrane based on the fluid mosaic model?

<p>Facilitate active transport (D)</p> Signup and view all the answers

According to Singer and Nicolson's fluid mosaic model, what does the term 'protein icebergs' refer to?

<p>Intrinsic and extrinsic proteins together (D)</p> Signup and view all the answers

How do proteins contribute to the flexibility of the plasma membrane?

<p>By providing strength (B)</p> Signup and view all the answers

What is the primary role of receptor proteins in the plasma membrane based on Singer and Nicolson's model?

<p>Active transport (A)</p> Signup and view all the answers

Which of the following is NOT a function attributed to proteins in the plasma membrane according to the fluid mosaic model?

<p>'Protein icebergs' analogy (A)</p> Signup and view all the answers

How does selective permeability of the plasma membrane benefit cells?

<p>By preventing useful molecules from entering (D)</p> Signup and view all the answers

'Selective permeability' of the plasma membrane primarily prevents which type of molecules from entering cells?

<p><em>Waste products</em> (B)</p> Signup and view all the answers

What is one of the main advantages provided by selective permeability of the plasma membrane based on Singer and Nicolson's model?

<p>Preventing metabolic intermediates from leaving cells (B)</p> Signup and view all the answers

What is the process through which water molecules move through a selective permeable membrane?

<p>Osmosis (C)</p> Signup and view all the answers

Which gas is used as an example to explain the diffusion process inside and outside a cell?

<p>CO2 (A)</p> Signup and view all the answers

In which direction does CO2 move when there is a difference in its concentration inside and outside a cell?

<p>Out of the cell (C)</p> Signup and view all the answers

What is the mechanism by which cells absorb water without expending energy?

<p>Osmosis (A)</p> Signup and view all the answers

Which molecules demonstrate a similar movement behavior to carbon dioxide and oxygen across the plasma membrane?

<p>Water (D)</p> Signup and view all the answers

What could happen if an animal cell or plant cell is placed in a solution of sugar or salt prepared in water?

<p>Cells will burst due to excess water intake (A)</p> Signup and view all the answers

What happens to a red blood cell in a hypotonic solution?

<p>The cell gains water and swells up (C)</p> Signup and view all the answers

Which solution would cause a plant cell to become plasmolyzed?

<p>Hypertonic solution (A)</p> Signup and view all the answers

What is the likely outcome for an animal cell in an isotonic solution?

<p>It maintains the same size (C)</p> Signup and view all the answers

What term is used to describe a concentrated solution with a higher solute concentration than a cell?

<p>Hypertonic solution (C)</p> Signup and view all the answers

In what condition would a red blood cell be crenated?

<p>Hypertonic solution (B)</p> Signup and view all the answers

What is the likely effect of placing a plant cell in a hypertonic solution?

<p>The cell will shrink (B)</p> Signup and view all the answers

What would happen if an animal cell is placed in a very dilute solution?

<p>The cell will gain water and burst (C)</p> Signup and view all the answers

What is the term used for a solution with the same water concentration as the cell?

<p>Isotonic solution (C)</p> Signup and view all the answers

Which type of solution would most likely cause a plant cell to become turgid?

<p>Hypotonic solution (B)</p> Signup and view all the answers

If a red blood cell is placed in a concentrated salt solution, what would be the expected outcome?

<p>The cell will shrink and become plasmolyzed (C)</p> Signup and view all the answers

What happens to dried raisins and apricots when placed in a concentrated solution of sugar or salt?

<p>They lose water and shrink (A)</p> Signup and view all the answers

Which of the following is true about osmosis according to Table 6 provided in the text?

<p>Equilibrium in the free energy of solvent molecules is achieved in the system (C)</p> Signup and view all the answers

What is the main difference between diffusion and osmosis?

<p>Equilibrium in the free energy of diffusing substances is never achieved (C)</p> Signup and view all the answers

In osmosis, what is the role of a semipermeable membrane?

<p>Regulates the movement of solvent molecules (C)</p> Signup and view all the answers

What happens to most plant cells and unicellular freshwater organisms through osmosis?

<p>They gain water through endosmosis (A)</p> Signup and view all the answers

What is the primary outcome of endosmosis when dried raisins and apricots are placed in pure water?

<p>They swell due to gaining water (C)</p> Signup and view all the answers

In osmosis, what influences the process besides the free energy of solvent molecules?

<p>Presence of other substances (C)</p> Signup and view all the answers

What would be the expected outcome for the blood drop marked as B in the experiment with human RBCs described in the text?

<p>RBCs appear swollen and haemolysed (D)</p> Signup and view all the answers

What is the main component removed when processing a hen's egg in diluted hydrochloric acid as described in the text?

<p>Calcium bicarbonate (A)</p> Signup and view all the answers

If an egg is placed in a concentrated salt solution, what is the expected outcome based on the osmosis experiment with an egg described in the text?

<p>The egg shrinks (B)</p> Signup and view all the answers

What happens to a red blood cell placed in a hypertonic solution according to the text?

<p>RBCs shrink (A)</p> Signup and view all the answers

In the experiment with human RBCs, what role does Ringer's solution play?

<p>It maintains RBC shape (C)</p> Signup and view all the answers

What is the purpose of observing the processed egg in pure water for 3-5 minutes in the osmosis experiment with an egg?

<p>To see if the egg swells (D)</p> Signup and view all the answers

What would be the most likely result if a red blood cell was placed in distilled water according to the information provided?

<p>The cell would burst (B)</p> Signup and view all the answers

How do RBCs differ when observed in an isotonic solution compared to a hypotonic solution based on the text?

<p>RBCs are shrunken in isotonic and swollen in hypotonic solutions (C)</p> Signup and view all the answers

What happens to an egg placed in diluted hydrochloric acid according to the text?

<p>The egg shell is removed leaving a skin around the egg (B)</p> Signup and view all the answers

What type of transport mechanism moves molecules against the concentration gradient with the help of carrier proteins and energy from ATP?

<p>Active transport (D)</p> Signup and view all the answers

Which biological process is a collective term for the ingestion of material by cells through the plasma membrane and requires energy, similar to active transport?

<p>Phagocytosis (B)</p> Signup and view all the answers

In which type of cellular transport process can molecules move through a biological membrane down the concentration gradient without the use of carrier proteins and energy?

<p>Passive diffusion (C)</p> Signup and view all the answers

What is the primary function of receptor-mediated endocytosis among the three types of endocytosis mentioned in the text?

<p>Selective uptake of large molecules (D)</p> Signup and view all the answers

Which ions are actively transported to maintain significant concentration gradients inside and outside animal cells?

<p>Sodium and potassium (C)</p> Signup and view all the answers

What is one of the key features that differentiate active transport from passive diffusion?

<p>Movement against concentration gradient (A)</p> Signup and view all the answers

Which process out of the listed options requires energy and is considered a form of active transport?

<p>Endocytosis (C)</p> Signup and view all the answers

What characteristic differentiates phagocytosis from potocytosis and receptor-mediated endocytosis?

<p>'Cell eating' large particles (B)</p> Signup and view all the answers

'Cellular drinking' is associated with which type of endocytosis?

<p>Potocytosis (A)</p> Signup and view all the answers

What is the primary source of energy used in active transport processes according to the text?

<p>ATP (A)</p> Signup and view all the answers

What is the main function of permeases in mediated transport?

<p>To enable solute molecules to cross the membrane (A)</p> Signup and view all the answers

How does facilitated diffusion differ from active transport in mediated transport?

<p>Facilitated diffusion requires no metabolic energy (C)</p> Signup and view all the answers

In active transport, how do substances move across the membrane?

<p>Against a concentration gradient with the help of energy (B)</p> Signup and view all the answers

What is the primary role of facilitated diffusion in animals according to the text?

<p>To transport glucose into body cells (D)</p> Signup and view all the answers

What distinguishes permeases from other proteins in the membrane?

<p>They are specific and facilitate the passage of certain molecules (C)</p> Signup and view all the answers

Why is active transport termed as such in mediated transport?

<p>Because it requires energy input for transporting molecules (C)</p> Signup and view all the answers

What distinguishes facilitated transport from active transport in mediated transport?

<p>Active transport involves movement against a concentration gradient (B)</p> Signup and view all the answers

How do permeases aid in mediated transport across the cell membrane?

<p>By creating small passageways through the membrane (A)</p> Signup and view all the answers

What term is used to describe the process of a vesicle releasing its contents outside the cell?

<p>Exocytosis (D)</p> Signup and view all the answers

How are the two membranes involved in exocytosis fused during the process?

<p>By rearrangement of lipid molecules (B)</p> Signup and view all the answers

What is the primary carbohydrate component of the rigid cell wall in plant cells?

<p>Cellulose (A)</p> Signup and view all the answers

What substance may be moved across a cell and released by exocytosis after being picked up by phagocytosis at one side of a blood vessel?

<p>IgA or immunoglobulin (D)</p> Signup and view all the answers

What is the function of the middle lamella in plant cells?

<p>Gluing adjacent cell walls together (C)</p> Signup and view all the answers

Which of the following is a function of a plant cell wall?

<p>Shape determination (D)</p> Signup and view all the answers

What happens to a plant cell when it loses water through osmosis?

<p>It undergoes plasmolysis (C)</p> Signup and view all the answers

What provides mechanical strength to support plant cells?

<p>Cellulose (D)</p> Signup and view all the answers

What is added to tissues like xylem to further increase their mechanical support?

<p>Lignin (A)</p> Signup and view all the answers

How do plasmodesmata contribute to intercellular connections in plant cells?

<p>By allowing exchange of materials (D)</p> Signup and view all the answers

What is the primary function of phagocytosis based on the text?

<p>Defense against foreign particles (A)</p> Signup and view all the answers

What distinguishes endocytotic vesicles from phagocytotic vesicles according to the text?

<p>Size (D)</p> Signup and view all the answers

What is the initial coating of the plasma membrane during phagocytosis as described in the text?

<p>Actin-myosin (A)</p> Signup and view all the answers

Which type of cells contain macrophages, as mentioned in the text?

<p>Connective tissue cells (D)</p> Signup and view all the answers

What is the key characteristic that differentiates phagocytosis from endocytosis according to the text?

<p>Nutritive and defensive function (A)</p> Signup and view all the answers

What is the fate of the phagosome after it detaches from the plasma membrane?

<p>Fuses with lysosomes (D)</p> Signup and view all the answers

Which organelle is actively involved in the digestion of ingested particles during phagocytosis?

<p>Lysosomes (C)</p> Signup and view all the answers

What occurs when a phagocyte engulfs a particle during phagocytosis?

<p>Actin-myosin forms a pocket around the particle. (B)</p> Signup and view all the answers

What initiates the formation of a pocket during phagocytosis, according to the text?

<p>Actin-myosin coating on the plasma membrane. (D)</p> Signup and view all the answers

What is the term used to describe the process when a vesicle fuses with the plasma membrane and releases its contents outside the cell?

<p>Exocytosis (A)</p> Signup and view all the answers

Which structure in plant cells determines cell shape, prevents desiccation, and is made up of cellulose microfibrils?

<p>Cell wall (D)</p> Signup and view all the answers

What is the primary function of a plant cell wall as described in the text?

<p>Maintain turgidity (A)</p> Signup and view all the answers

Which component of the plant cell wall has narrow pores called pits that allow exchange of materials between cells?

<p>Middle lamella (B)</p> Signup and view all the answers

What is the term for the phenomenon where a plant cell loses water through osmosis, leading to shrinkage of the protoplasm away from the cell wall?

<p>Plasmolysis (B)</p> Signup and view all the answers

Which substance is responsible for forming the jelly-like middle lamella in plant cells?

<p>Calcium and magnesium pectate (A)</p> Signup and view all the answers

What is the primary role of lignin in plant tissues like xylem according to the text?

<p>Increase in mechanical strength (B)</p> Signup and view all the answers

What is a distinguishing feature of plasmodesmata mentioned in the text?

<p>Narrow pores connecting adjacent plant cells (A)</p> Signup and view all the answers

What primarily determines the visibility of plant cells as distinct units under a microscope based on the text?

<p>Cell wall structure (D)</p> Signup and view all the answers

What activity involves examining leaf cells under a microscope after mounting a Rheo leaf in water on a slide?

<p>Microscopy (A)</p> Signup and view all the answers

What is the primary role of macrophages in phagocytosis?

<p>Engulfing cellular debris (D)</p> Signup and view all the answers

How do phagocytotic vesicles differ from endocytotic vesicles based on the text?

<p>Phagocytotic vesicles are larger (B)</p> Signup and view all the answers

What is the initial coating of the plasma membrane in phagocytosis?

<p>Actin-myosin (C)</p> Signup and view all the answers

What is the primary function of lysosomal enzymes in phagocytosis?

<p>Digesting cellular debris (A)</p> Signup and view all the answers

In phagocytosis, which organelles join with the vacuole containing the ingested particle?

<p>Lysosomes (A)</p> Signup and view all the answers

What is a key difference between endocytosis and phagocytosis based on the text?

<p>Phagocytosis is a defensive process (D)</p> Signup and view all the answers

What happens to the phagosome after it detaches from the plasma membrane in phagocytosis?

<p>It joins with the vacuole containing ingested particles (B)</p> Signup and view all the answers

Which statement accurately describes the involvement of white blood cells in phagocytosis?

<p><strong>White blood cells engulf cellular debris and uninvited microbes</strong> (D)</p> Signup and view all the answers

What is the primary function of the nucleolus based on the information provided?

<p>It helps in controlling the structure and function of cells (C)</p> Signup and view all the answers

How do chromosomes primarily store hereditary information as per the text?

<p>Using DNA and proteins such as histones (C)</p> Signup and view all the answers

What gives chromosomes their characteristic shape?

<p>Telomeres at the centromere (A)</p> Signup and view all the answers

During cell division, what happens when sister chromatids are held together?

<p>They remain attached at their centromeres (B)</p> Signup and view all the answers

What distinguishes chromosomes from nucleoli in their respective functions?

<p>Chromosomes control cell structure, while nucleoli synthesize ribosomal subunits (B)</p> Signup and view all the answers

What is the significance of telomeres in chromosomes?

<p>They help maintain chromosome shape during replication (D)</p> Signup and view all the answers

How do sister chromatids relate to each other during cell division?

<p>They remain attached at the centromere as sister chromatids (B)</p> Signup and view all the answers

What distinguishes DNA's role from proteins within a chromosome?

<p><strong>DNA</strong> serves as genetic material, while proteins have structural functions within chromosomes (A)</p> Signup and view all the answers

What is the term used to describe a cell that has half the number of chromosomes, with one of each kind?

<p>Monoploid cell (A)</p> Signup and view all the answers

Which process originates the diploid state of organisms according to the text?

<p>Fertilization (C)</p> Signup and view all the answers

What cells in human beings are diploid?

<p>Somatic cells (B)</p> Signup and view all the answers

What is the significance of cells labeled as haploid in the text?

<p>They are crucial for sexual reproduction (A)</p> Signup and view all the answers

What is the term used for a set comprising unpaired chromosomes of each kind?

<p>Haploid set (D)</p> Signup and view all the answers

What is the term used to describe the inner granular mass of the cytoplasm?

<p>Endoplasm (A)</p> Signup and view all the answers

Which part of the cell is described as the soluble part of cytoplasm?

<p>Cytosol (A)</p> Signup and view all the answers

What system of protein fibers is found in the cytosol?

<p>Cytoskeleton (D)</p> Signup and view all the answers

Which substance forms the ground substance or 'background material' of the cytoplasm?

<p>Cytosol (C)</p> Signup and view all the answers

What does the cytoskeleton contain?

<p>Three types of protein fibers (D)</p> Signup and view all the answers

Which layer of the cytoplasm is described as more gel-like?

<p>Ectoplasm (C)</p> Signup and view all the answers

What percentage of water does Cytosol contain?

<p>~90% (A)</p> Signup and view all the answers

What is a colloidal solution primarily composed of in the cytoplasm?

<p>Proteins (A)</p> Signup and view all the answers

What is located between the plasma membrane and nuclear envelope in a cell?

<p>Cytoplasm (A)</p> Signup and view all the answers

What term is used to describe the outer, clearer layer of the cytoplasm?

<p>Ectoplasm (D)</p> Signup and view all the answers

What is the primary function of microtubules, microfilaments, and intermediate filaments in cellular movement?

<p>Help the cells maintain their shapes (A)</p> Signup and view all the answers

Which chemical element is the most abundant in the cytoplasm or cytosol?

<p>Oxygen (C)</p> Signup and view all the answers

Which organelle is responsible for synthesizing energy-rich ATP within the cell?

<p>Mitochondria (B)</p> Signup and view all the answers

What is the function of lysosomes in a cell?

<p>Digesting substances taken up by the cell (D)</p> Signup and view all the answers

Which part of the cell is described as a 'small organ' and has a definite shape, structure, and function?

<p>Cell organelles (D)</p> Signup and view all the answers

What is the main function of plasma membranes in cells?

<p>Keeping cell contents separate from the external environment (A)</p> Signup and view all the answers

Where does glycolysis take place within a cell?

<p>Cytosol (C)</p> Signup and view all the answers

What is the major site for protein synthesis within a cell?

<p>Ribosomes (D)</p> Signup and view all the answers

Which organelle is primarily responsible for lipid synthesis within a cell?

<p>Endoplasmic reticulum (C)</p> Signup and view all the answers

What is the primary function of smooth endoplasmic reticulum?

<p>Synthesizing lipids and steroid hormones (B)</p> Signup and view all the answers

Which organelle is abundant in liver and testicular cells for synthesizing steroid hormones?

<p>Smooth endoplasmic reticulum (B)</p> Signup and view all the answers

What is a major difference between rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER)?

<p>Presence of ribosomes on the outer surface (D)</p> Signup and view all the answers

Where are digestive (hydrolytic) enzymes of lysosomes primarily produced?

<p>Rough ER (D)</p> Signup and view all the answers

What role does Golgi apparatus play in the cell?

<p>Processing and packaging proteins and lipids (C)</p> Signup and view all the answers

Which organelle arises from the membrane of smooth endoplasmic reticulum?

<p>Golgi apparatus (A)</p> Signup and view all the answers

What is the primary function of rough endoplasmic reticulum (RER) in a cell?

<p>Transporting proteins (D)</p> Signup and view all the answers

Which type of endoplasmic reticulum is involved in the synthesis of fats, steroids, and cholesterol?

<p>Smooth endoplasmic reticulum (C)</p> Signup and view all the answers

Which organelle forms the supporting skeletal framework of a cell?

<p>Endoplasmic reticulum (B)</p> Signup and view all the answers

In which cell organelle do certain enzymes synthesize fats, steroids, and cholesterol?

<p>Smooth endoplasmic reticulum (A)</p> Signup and view all the answers

What is a characteristic function of rough endoplasmic reticulum (RER) compared to smooth endoplasmic reticulum (SER)?

<p>Protein transport (A)</p> Signup and view all the answers

Which type of endoplasmic reticulum lacks ribosomes on its surface?

<p>Smooth endoplasmic reticulum (B)</p> Signup and view all the answers

What is the main function of smooth endoplasmic reticulum (SER) in liver cells?

<p>Detoxification (D)</p> Signup and view all the answers

What does the rough endoplasmic reticulum (RER) use ribosomes for?

<p>Protein synthesis (B)</p> Signup and view all the answers

What did Camillo Golgi develop a staining technique for in 1873?

<p>Nervous system exploration (D)</p> Signup and view all the answers

In 1898, what did Camillo Golgi identify and describe in neurons?

<p>Golgi apparatus (D)</p> Signup and view all the answers

What role does the Golgi apparatus play in eukaryotic cells?

<p>Macromolecule modification (B)</p> Signup and view all the answers

What did Camillo Golgi share the Nobel Prize in Physiology and Medicine for in 1906?

<p>Nervous system structure studies (D)</p> Signup and view all the answers

Which cellular secretions are produced by the Golgi apparatus?

<p>Enzymes and proteins (A)</p> Signup and view all the answers

What is the primary function of the Golgi apparatus in a cell?

<p>Secretory processing and packaging (D)</p> Signup and view all the answers

What distinguishes Santiago Ramon y Cajal in the history of Cell and Molecular Biology?

<p>'Most cited' scientist (D)</p> Signup and view all the answers

'Zymogens' mentioned in the text are dispatched to which targets by the Golgi apparatus?

<p>'Extracellular targets' (A)</p> Signup and view all the answers

'Red-colored cell sap' in plant cells is primarily due to the presence of what substance?

<p>'Anthocyanins' (C)</p> Signup and view all the answers

What is the primary function of lysosomes within a cell?

<p>Digesting organic materials with powerful enzymes (C)</p> Signup and view all the answers

In what way did Golgi's staining method revolutionize neuroscience?

<p>By enabling the visualization of individual nerve structures (B)</p> Signup and view all the answers

What is the role of mitochondria in cellular respiration?

<p>Synthesizing ATP molecules (C)</p> Signup and view all the answers

What distinguishes lysosomes from mitochondria based on their functions in a cell?

<p>Lysosomes break down organic materials, while mitochondria are energy powerhouses (B)</p> Signup and view all the answers

What is the significance of mitochondria's inner membrane structure in cellular function?

<p>To increase the surface area for energy production (D)</p> Signup and view all the answers

How do lysosomes contribute to maintaining cellular health?

<p>By digesting and removing cell debris (C)</p> Signup and view all the answers

Why are lysosomes often referred to as 'suicide bags'?

<p>For potentially bursting and digesting their own cells (B)</p> Signup and view all the answers

What distinguishes the structure of lysosomes from mitochondria at the cellular level?

<p>Lysosomes have a porous outer membrane, while mitochondria have a single membrane envelope (C)</p> Signup and view all the answers

What is the primary characteristic that distinguishes Golgi's work from Cajal's contributions to neuroscience?

<p>Golgi revolutionized staining techniques for individual nerve structures, while Cajal established the nerve cell as the basic structural unit. (D)</p> Signup and view all the answers

What makes mitochondria and plastids semiautonomous organelles?

<p>They have their own genome and ribosomes (A)</p> Signup and view all the answers

What is the primary role of chromoplasts in plant cells?

<p>Produce pigments (D)</p> Signup and view all the answers

What is the main characteristic that differentiates leucoplasts from chromoplasts?

<p>Coloration (A)</p> Signup and view all the answers

Which pigment is responsible for the orange to reddish coloration of non-green chromoplasts?

<p>Carotenes and xanthophylls (A)</p> Signup and view all the answers

What is the function of green chloroplasts?

<p>Perform photosynthesis (C)</p> Signup and view all the answers

Which type of plastid would most likely be found in the storage cells of plant roots?

<p>Aleuroplasts (D)</p> Signup and view all the answers

What is the common characteristic between mitochondria and plastids regarding their division?

<p>'Binary fission' method of division (C)</p> Signup and view all the answers

Which organelle can be formed from leucoplasts or chloroplasts?

<p>'Chromoplasts' (B)</p> Signup and view all the answers

What is a distinguishing feature of leucoplasts compared to other types of plastids?

<p>Colorless nature (A)</p> Signup and view all the answers

Which type of plastid provides color to organs, such as flowers and fruits, for attracting animals?

<p>Chromoplasts (C)</p> Signup and view all the answers

In which plastid would you find lamellae present along with chlorophylls and carotenoids?

<p>Chloroplasts (A)</p> Signup and view all the answers

What is a notable characteristic of chromoplasts that distinguishes them from chloroplasts?

<p>Lack of chlorophyll (A)</p> Signup and view all the answers

Which plastid type is involved in providing color to organs for attracting pollinators and disseminators?

<p>Chromoplasts (D)</p> Signup and view all the answers

Which type of plastid is responsible for taking part in the storage of food materials like carbohydrates and lipids?

<p>Leucoplasts (D)</p> Signup and view all the answers

What distinguishes chromopiasts from other plastids in terms of their color and shape?

<p>They are brownish to reddish in color and irregular in shape. (B)</p> Signup and view all the answers

What is a unique feature of chromoplasts that distinguishes them from other plastids regarding their function?

<p>Adding color to attract animals (D)</p> Signup and view all the answers

Which feature distinguishes chloroplasts as the primary sites of photosynthesis within plant cells?

<p>Presence of flattened sacs containing chlorophyll molecules (B)</p> Signup and view all the answers

What makes leucoplasts unique among other plastids concerning their presence in cells?

<p>Colorless nature and shape characteristics (C)</p> Signup and view all the answers

What is the main function of vacuoles in plant cells?

<p>Maintain osmotic pressure (C)</p> Signup and view all the answers

During cell division, what are the daughter cells formed from a parent cell called?

<p>Daughter cells (B)</p> Signup and view all the answers

What is the primary purpose of mitosis in multicellular organisms?

<p>Growth of the organism (B)</p> Signup and view all the answers

In meiosis, what occurs during the second division (meiosis II)?

<p>Formation of haploid cells (C)</p> Signup and view all the answers

What differentiates meiosis I from mitosis in terms of chromosome number?

<p>Meiosis I reduces chromosome number (B)</p> Signup and view all the answers

What role does a vacuole play in providing turgidity to plant cells?

<p>Maintaining osmotic pressure (D)</p> Signup and view all the answers

What is the significance of cell division for asexual reproduction in plants?

<p>Production of vegetative propagules (D)</p> Signup and view all the answers

How do the daughter cells produced through mitosis compare to the parent cell?

<p><strong>They are genetically similar or identical</strong> (C)</p> Signup and view all the answers

What is essential for sexual reproduction in terms of gamete formation?

<p><strong>Meiosis</strong> (C)</p> Signup and view all the answers

What distinguishes meiosis II from meiosis I in terms of chromosome separation?

<p><strong>Two daughter chromatids separate</strong> (D)</p> Signup and view all the answers

What is the primary distinguishing feature between mitochondria and vacuoles as described in the text?

<p>Energy liberation (D)</p> Signup and view all the answers

How do chloroplasts differ from mitochondria based on their function as described in the text?

<p>Food synthesis (A)</p> Signup and view all the answers

Which organelle is primarily responsible for maintaining water balance in protozoans as mentioned in the text?

<p>Vacuoles (C)</p> Signup and view all the answers

What crucial role do vacuoles play in plant cells according to the information provided?

<p>Storage and maintaining cell shape (C)</p> Signup and view all the answers

Which statement accurately describes the difference in colour between mitochondria and chloroplasts?

<p>Mitochondria are colourless, and chloroplasts are green. (C)</p> Signup and view all the answers

What is a characteristic feature that distinguishes the inner membrane structure of mitochondria from that of chloroplasts as mentioned in the text?

<p>Cristae in mitochondria vs. thylakoids in chloroplasts (B)</p> Signup and view all the answers

How do vacuoles in animal cells differ from vacuoles in plant cells based on the information provided?

<p>Animal cell vacuoles store water, plant cell vacuoles store proteins. (B)</p> Signup and view all the answers

Which of the following is a primary function of chloroplasts mentioned in the text?

<p>Synthesizing food by photosynthesis (D)</p> Signup and view all the answers

How do mitochondria and chloroplasts differ in terms of oxygen consumption and liberation as described in the text?

<p>Mitochondria consume O2 and liberate CO2, while chloroplasts consume CO2 and liberate O2. (B)</p> Signup and view all the answers

Which process is responsible for reducing the chromosome number to half in cells according to the text?

<p>Meiosis (A)</p> Signup and view all the answers

What is a distinguishing feature of plant cells compared to animal cells based on the information provided?

<p>Larger cell size (B)</p> Signup and view all the answers

Which organelle is characteristic of animal cells but not typically found in plant cells as mentioned in the text?

<p>Centrosome (C)</p> Signup and view all the answers

What is the primary role of the Golgi apparatus in animal cells according to the text?

<p>Transport and modification of proteins (A)</p> Signup and view all the answers

In terms of genetic variations, which type of cell division is responsible for producing more diversity?

<p>Meiosis in diploid cells (D)</p> Signup and view all the answers

What differentiates plant cells from animal cells based on the presence of plastids?

<p>Chlorophyll presence (C)</p> Signup and view all the answers

Which characteristic organelle is commonly found in animal cells but not typically in plant cells?

<p>Centrosome (C)</p> Signup and view all the answers

What is a distinguishing feature of the Golgi apparatus between animal and plant cells according to the information provided?

<p>Golgi apparatus complexity (B)</p> Signup and view all the answers

Which organelle's presence or absence highlights a significant difference between plant and animal cells according to the text?

<p>Centrioles (D)</p> Signup and view all the answers

What distinguishes the genetic material of prokaryotic cells from eukaryotic cells?

<p>Prokaryotic cells have smaller nucleoids compared to eukaryotic cells. (C)</p> Signup and view all the answers

What is a distinguishing feature of viruses in terms of cellular classification?

<p>Viruses are neither prokaryotic nor eukaryotic and lack cellular organelles. (C)</p> Signup and view all the answers

Which organelles in a eukaryotic cell have two membranes surrounding them?

<p>Nucleus and chloroplasts (C)</p> Signup and view all the answers

What is the primary function of plasmodesmata in plant cells?

<p>Transport of materials between adjacent cells (B)</p> Signup and view all the answers

What distinguishes the ribosomes found in prokaryotic cells from those in eukaryotic cells?

<p>Prokaryotic ribosomes are smaller (70 S) compared to eukaryotic ribosomes (80 S). (D)</p> Signup and view all the answers

What is the primary function of the tonoplast in plant cells?

<p>Vacuole membrane (B)</p> Signup and view all the answers

Which statement accurately describes the membrane characteristics of various cell organelles?

<p>Ribosomes and nucleolus are membrane-bound organelles. (D)</p> Signup and view all the answers

'Middle lamella' serves as what part of plant cell structure?

<p>Connection between adjacent plant cells (D)</p> Signup and view all the answers

Which organelles can replicate themselves due to possessing DNA and ribosomes?

<p>Mitochondria and plastids (C)</p> Signup and view all the answers

What is the role of plasmodesmata in plant cell communication?

<p>Allowing transport of materials between adjacent plant cells (C)</p> Signup and view all the answers

What is a major distinction between eukaryotic and prokaryotic cells based on the text?

<p>Presence of a true nucleus in eukaryotic cells (D)</p> Signup and view all the answers

What is the primary function of lysosomes as indicated in the text?

<p>Digestion of organic molecules (B)</p> Signup and view all the answers

Where do chromoplasts primarily function within a cell?

<p>Providing color to flowers and fruits (D)</p> Signup and view all the answers

Which organelle is responsible for synthesizing energy-rich ATP within the cell?

<p>Mitochondria (C)</p> Signup and view all the answers

In terms of cellular structure, what distinguishes ribosomes from centrioles and nucleolus?

<p>Membrane-bound nature (D)</p> Signup and view all the answers

What characteristic feature describes the plasma membrane based on its composition?

<p>Rigid and freely permeable (A)</p> Signup and view all the answers

'Protoplast' of a cell consists of which components according to the text?

<p>Cytoplasm, nucleus, and mitochondria (B)</p> Signup and view all the answers

What is a key distinction between SER and RER based on their function within a cell?

<p>Lipid synthesis by SER and protein synthesis by RER (B)</p> Signup and view all the answers

What sets chloroplasts apart from mitochondria based on their respective functions within the cell?

<p>Converting sunlight into chemical energy vs. using molecular oxygen for energy production (C)</p> Signup and view all the answers

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