Prokaryotic vs Eukaryotic Cells Quiz
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Questions and Answers

What distinguishes eukaryotic cells from prokaryotic cells?

  • The presence of ribosomes
  • The absence of a cell wall
  • The presence of a nucleus (correct)
  • The absence of a plasma membrane
  • Which of the following organelles is NOT involved in the manufacture, distribution, or breakdown of molecules?

  • Mitochondria (correct)
  • Lysosomes
  • Endoplasmic reticulum
  • Golgi apparatus
  • What is the primary function of the cytoskeleton in eukaryotic cells?

  • Producing energy
  • Synthesizing proteins
  • Storing genetic information
  • Providing structural support and facilitating movement (correct)
  • How do the internal membranes of eukaryotic cells contribute to their functionality?

    <p>They create compartments that maintain specific chemical conditions for different metabolic processes. (A)</p> Signup and view all the answers

    Which of the following best describes the role of enzymes in eukaryotic cell metabolism?

    <p>Enzymes act as catalysts to speed up metabolic reactions. (A)</p> Signup and view all the answers

    Which of the following features is present in both prokaryotic and eukaryotic cells?

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

    What is the main difference between prokaryotic and eukaryotic ribosomes?

    <p>Prokaryotic ribosomes are smaller than eukaryotic ribosomes. (A)</p> Signup and view all the answers

    Which of the following is a characteristic of prokaryotic cells, but not eukaryotic cells?

    <p>Presence of a cell wall (B), Presence of a nucleoid (A)</p> Signup and view all the answers

    What is the function of the bacterial flagella?

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

    Which of the following statements accurately describes the structure of the nucleoid in prokaryotic cells?

    <p>A region within the cytoplasm where DNA is concentrated, but not enclosed by a membrane (C)</p> Signup and view all the answers

    The fluid mosaic model describes the plasma membrane as a dynamic structure. What characteristic contributes most to this fluidity?

    <p>The ability of phospholipids to move laterally (C)</p> Signup and view all the answers

    A molecule easily crosses the plasma membrane without the help of a membrane protein. This molecule is most likely:

    <p>A small, non-polar molecule (B)</p> Signup and view all the answers

    Membrane proteins that facilitate the movement of specific molecules across the membrane are called:

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

    Which of the following is NOT a function of membrane proteins?

    <p>Synthesizing new phospholipids for the membrane (C)</p> Signup and view all the answers

    What is the main driving force behind diffusion?

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

    Why is passive transport considered "passive"?

    <p>It does not require the use of energy by the cell. (A)</p> Signup and view all the answers

    Which of the following molecules can easily diffuse across the phospholipid bilayer of a cell membrane?

    <p>Oxygen molecules (O2) (D)</p> Signup and view all the answers

    How does the phospholipid bilayer contribute to the selective permeability of the cell membrane?

    <p>It allows specific molecules to pass through based on their size, polarity, and the presence of transport proteins. (B)</p> Signup and view all the answers

    Which of the following statements accurately describes the relationship between diffusion and concentration gradients?

    <p>Diffusion occurs down the concentration gradient, without requiring energy input. (C)</p> Signup and view all the answers

    During cellular respiration, which molecule accepts electrons at the bottom of the electron transport chain?

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

    What is the primary function of NAD+ in cellular respiration?

    <p>Transporting electrons from glucose to the electron transport chain (A)</p> Signup and view all the answers

    What is the primary reason cellular respiration is considered a controlled process?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the role of dehydrogenase enzymes in cellular respiration?

    <p>They transfer electrons from glucose to NAD+ (C)</p> Signup and view all the answers

    What is the relationship between oxidation and reduction in cellular respiration?

    <p>They always occur together, with one involving the loss of electrons and the other the gain of electrons. (A)</p> Signup and view all the answers

    Which of the following molecules is a primary fuel source for cellular respiration?

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

    What is the significance of the electron transport chain in cellular respiration?

    <p>It transfers electrons from glucose to oxygen, releasing energy. (C)</p> Signup and view all the answers

    Why is the heat released during cellular respiration important for animals?

    <p>It helps maintain a constant body temperature. (D)</p> Signup and view all the answers

    What is the main difference between the energy release in burning sugar and in cellular respiration?

    <p>Cellular respiration releases energy in small, controlled amounts. (D)</p> Signup and view all the answers

    What is the role of ATP in cells?

    <p>Providing energy for cellular work (D)</p> Signup and view all the answers

    Which of the following is the most accurate statement about the relationship between photosynthesis and cellular respiration?

    <p>Photosynthesis produces energy-rich molecules that are broken down by cellular respiration to release energy. (D)</p> Signup and view all the answers

    Why is the statement "Plant cells perform photosynthesis, and animal cells perform cellular respiration" misleading?

    <p>Plant cells perform both photosynthesis and cellular respiration, while animal cells primarily perform cellular respiration. (B)</p> Signup and view all the answers

    Which of the following best describes the relationship between breathing and cellular respiration?

    <p>Breathing provides oxygen for cellular respiration. (C)</p> Signup and view all the answers

    Flashcards

    Prokaryotic Cells

    Cells lacking a membrane-enclosed nucleus and organelles; found in Bacteria and Archaea.

    Eukaryotic Cells

    Cells with a membrane-enclosed nucleus and organelles; all organisms except bacteria and archaea.

    Ribosomes

    Cell structures made of RNA and protein; sites of protein synthesis in the cytoplasm.

    Plasma Membrane

    Boundary membrane of all cells; selectively allows ions and molecules to pass.

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    Nucleoid

    Non-membrane-bound region in prokaryotic cells where DNA is concentrated.

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    Capsule

    A sticky outer coat that helps prokaryotes adhere to surfaces or other cells.

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    Nucleus

    The most distinctive feature of eukaryotic cells, containing genetic material.

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    Organelles

    Membrane-bound structures in eukaryotic cells that perform specific functions.

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    Endoplasmic Reticulum (ER)

    An organelle involved in the manufacture and transport of molecules; consists of smooth and rough types.

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    Fluid Mosaic Model

    Model depicting the plasma membrane as a mosaic of protein molecules in a phospholipid bilayer.

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    Phospholipids

    Lipids with two fatty acids and a phosphate group; essential for forming cell membranes.

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    Selective Permeability

    Feature of a membrane that allows only certain substances to pass through.

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    Hydrophilic

    'Water-loving' parts of molecules that dissolve in water.

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    Lipid Bilayer

    Double layer of phospholipids forming the core structure of cell membranes.

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    Phospholipid Bilayer

    A cell membrane structure with hydrophilic heads and hydrophobic tails regulating substance movement.

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    Passive Transport

    Movement of substances across a membrane without energy expenditure by the cell.

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    Diffusion

    The random movement resulting in net movement of particles from higher to lower concentration.

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    Concentration Gradient

    A difference in concentration of a substance across a distance or membrane.

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    Photosynthesis

    The process converting sunlight into chemical energy stored in sugars from CO2 and water.

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    Cellular Respiration

    The process that breaks down food molecules, using oxygen to produce ATP, CO2, and water.

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    Energy Flow in Ecosystems

    Energy from sunlight flows one way through ecosystems, not recycled like matter.

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    Breathing vs. Cellular Respiration

    Breathing involves gas exchange; cellular respiration uses oxygen to make ATP.

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    Recycling of Matter

    Matter is cycled in ecosystems, like CO2 and water, through photosynthesis and cellular respiration.

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    ATP

    Adenosine triphosphate, the energy currency used for cellular work produced in cellular respiration.

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    Exergonic Process

    A reaction that releases energy, such as cellular respiration releasing energy from glucose.

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    Oxidation

    Loss of electrons in a redox reaction; occurs when glucose is oxidized to CO2.

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    Reduction

    Gain of electrons in a redox reaction; happens when O2 is reduced to H2O.

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    Redox Reaction

    Short for reduction-oxidation; involves electron transfer between molecules.

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    NADH

    Reduced form of NAD+; an electron carrier that transports electrons to the electron transport chain.

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    Electron Transport Chain

    A series of proteins in mitochondria that transfer electrons and create ATP from the released energy.

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    Dehydrogenation

    Removal of hydrogen atoms from a molecule, typically during oxidation in cellular respiration.

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    Proton Gradient

    A concentration difference of protons across a membrane; used to generate ATP in respiration.

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    Study Notes

    Prokaryotic vs Eukaryotic Cells

    • Prokaryotic cells evolved first, dominating Earth for over 1.5 billion years.
    • Eukaryotic cells evolved from prokaryotic cells around 1.8 billion years ago.
    • Prokaryotic cells are simpler and smaller than eukaryotic cells.
    • Eukaryotic cells have a nucleus and other membrane-bound organelles.
    • Both cell types have a plasma membrane, cytosol, chromosomes, and ribosomes.
    • Prokaryotic cells do not have a nucleus or other membrane-bound organelles.

    Prokaryotic Cell Structure

    • DNA is coiled into a nucleoid region, not surrounded by a membrane.
    • Prokaryotic ribosomes are smaller than eukaryotic ribosomes.
    • Most have a rigid cell wall outside the plasma membrane.
    • Some have a sticky capsule that helps them adhere to surfaces.
    • Some have flagella for movement.
    • May possess fimbriae for attachment.

    Eukaryotic Cell Structure

    • Organelles are membrane-bound compartments.
    • Nucleus houses the cell's DNA, organized into chromosomes.
    • Ribosomes are sites of protein synthesis, either free in cytoplasm or bound to the rough ER.
    • Endoplasmic Reticulum (ER) produces proteins, lipids, and membrane components.
    • Rough ER has ribosomes attached, for protein export.
    • Smooth ER lacks ribosomes, synthesizes lipids and detoxifies substances.
    • Golgi apparatus processes, sorts, and ships proteins or lipids.
    • Lysosomes contain digestive enzymes.
    • Vacuoles store and transport materials (central vacuole in plants, contractile vacuoles in protists).
    • Mitochondria generate ATP; Chloroplasts, convert solar energy in plants/algae, are also part of the endomembrane system.
    • Cytoskeleton provides structural support, movement, and internal organization, Composed of proteins.

    Nucleus

    • Contains the cell's genetic instructions (DNA).
    • DNA is organized into chromosomes, visible during cell division.
    • Nucleolus is a site of rRNA synthesis and ribosome production.
    • Nuclear envelope controls passage of materials in and out of the nucleus (with pores).
    • Chromatin is the complex of DNA and proteins when the cell isn't dividing.

    Endomembrane System

    • Connected network of membranes (nuclear envelope, ER, Golgi, lysosomes, vacuoles, and plasma membrane).
    • Modifies, sorts, and ships proteins or lipids with further processing/packaging.
    • Produces proteins, lipids, and membrane components.

    Ribosomes

    • Cellular protein factories, synthesize proteins, either free in cytoplasm or bound to the rough ER.
    • Free ribosomes synthesize proteins for use in the cytosol, while bound ribosomes make proteins to be exported or incorporated into the endomembrane system.
    • Ribosomes are structurally identical, but function differently depending on their location.

    Mitochondria

    • Generate ATP through cellular respiration.
    • Have two membranes (outer and inner).
    • Inner membrane has folds called cristae, increasing surface area for ATP synthesis.
    • Contain their own DNA and ribosomes (evidence supporting the endosymbiotic theory).

    Chloroplasts

    • Carry out photosynthesis in plants and algae.
    • Have two membranes (outer and inner).
    • Thylakoids are the site of chlorophyll and light-capturing reactions, are stacked into grana.
    • Stroma is the fluid surrounding the thylakoid sacs.
    • Contain their own DNA and ribosomes (evidence supporting the endosymbiotic theory).

    Lysosomes

    • Membrane-bound organelles containing digestive enzymes.
    • Break down and recycle damaged organelles, excess materials, or engulfed substances for cellular recycling.

    Vacuoles

    • Membrane-bound sacs for storage, transport, or elimination of materials.
    • Central vacuole in plants stores water and maintains turgor pressure.
    • Contractile vacuoles in protists regulate water content.

    Peroxisomes

    • Contain enzymes for detoxification of harmful substances (hydrogen peroxide).
    • Important for various metabolic processes (lipid metabolism).

    Other

    • Cytoskeleton provides structural support, movement, and internal organization, composed of proteins.
    • Cell walls provide support and protection (plant and fungi cells).
    • Prokaryotic cells may have flagella for movement, fimbriae for attachment, and a capsule.
    • Eukaryotic cells may have cilia or flagella for movement.

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    Description

    Test your knowledge on the fundamental differences between prokaryotic and eukaryotic cells. Explore their structures, functions, and evolutionary significance. This quiz will enhance your understanding of cellular biology concepts.

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