Biology Cellular Structures and Functions
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Questions and Answers

What is a nucleolus?

Structure in nucleus that is the site for ribosome synthesis.

What is a vesicle?

Small, membrane-bound sac that functions in storage and transport within a cell.

What is a lysosome?

Component of membrane-bound organelles that digests nutrients and cellular wastes.

How do the nucleus and ribosomes work together to produce proteins?

<p>In the nucleus, an mRNA copy of a gene is produced, which ribosomes use as instructions to synthesize a specific protein.</p> Signup and view all the answers

What components are involved in the endomembrane system?

<p>Nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, plasma membrane.</p> Signup and view all the answers

What is magnification?

<p>Increase in the apparent size of an object.</p> Signup and view all the answers

What does resolution refer to in microscopy?

<p>Clarity of an image; the ability to distinguish two objects as two objects.</p> Signup and view all the answers

What is a light microscope used for?

<p>Observing thin or transparent samples on slides.</p> Signup and view all the answers

What is an electron microscope used for?

<p>Range of samples that can be opaque and of varying thicknesses.</p> Signup and view all the answers

What is cell theory?

<p>All living things are made of cells; cells are the basic unit of life; cells come from other cells.</p> Signup and view all the answers

What are bacteria and archaea?

<p>Prokaryotic cells that are smaller and simpler in structure.</p> Signup and view all the answers

What roles do the nucleus and ribosomes play in cells?

<p>They are involved in the genetic control of cells.</p> Signup and view all the answers

What organelles are involved in the manufacture, distribution, and breakdown of molecules?

<p>Endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and peroxisomes.</p> Signup and view all the answers

What is the function of mitochondria and chloroplasts?

<p>Energy processing.</p> Signup and view all the answers

What structures provide support and communication between cells?

<p>Cytoskeleton, plasma membrane, and cell wall.</p> Signup and view all the answers

What organelles are not found in plant cells?

<p>Lysosomes and centrioles.</p> Signup and view all the answers

What structures are found only in plant cells?

<p>Cell walls, chloroplasts, and central vacuoles.</p> Signup and view all the answers

What is the role of a lysosome?

<p>Digests nutrients and cellular wastes.</p> Signup and view all the answers

What does a cell wall do?

<p>Protects cell, provides structural support, gives shape to cell.</p> Signup and view all the answers

What does the nucleus contain?

<p>Nuclear envelope, chromatin, nucleolus, most of the cell's DNA.</p> Signup and view all the answers

What is the nuclear envelope?

<p>Membrane enclosing the nucleus, protein-lined pores, attached to the endoplasmic reticulum.</p> Signup and view all the answers

What is chromatin?

<p>DNA plus associated proteins.</p> Signup and view all the answers

What is a nucleolus?

<p>Condensed region where ribosomes are formed.</p> Signup and view all the answers

What are peroxisomes?

<p>Organelles that metabolize waste.</p> Signup and view all the answers

What is rough ER associated with?

<p>Ribosomes and makes secretory and membrane proteins.</p> Signup and view all the answers

What is smooth ER responsible for?

<p>Makes lipids, stores calcium ions, helps in lipid synthesis.</p> Signup and view all the answers

What are the components of the cytoskeleton?

<p>Microtubule, microfilament, intermediate filament.</p> Signup and view all the answers

What are ribosomes responsible for?

<p>Cell's protein synthesis.</p> Signup and view all the answers

What are free ribosomes?

<p>Ribosomes suspended in cytoplasm, typically involved in making proteins that function within the cytoplasm.</p> Signup and view all the answers

What are bound ribosomes?

<p>Ribosomes attached to the rough ER, associated with packaged proteins for export.</p> Signup and view all the answers

What do both rough and smooth ER form?

<p>Vesicles that travel to other parts of the cell.</p> Signup and view all the answers

What is the function of the Golgi apparatus?

<p>Molecular warehouse and finishing factory for products manufactured by the ER.</p> Signup and view all the answers

Study Notes

Cellular Structures and Functions

  • Nucleolus: Located within the nucleus, responsible for ribosome synthesis.
  • Vesicle: Membrane-bound sacs that serve in cellular storage and transport.
  • Lysosome: Digestive organelle that breaks down nutrients and waste; not found in plant cells.
  • Endomembrane System: Comprises the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and plasma membrane, facilitating synthesis, storage, and transport of molecules.

Protein Synthesis Process

  • Proteins are synthesized in ribosomes using mRNA transcribed from DNA in the nucleus, acting as instructional templates.

Microscopy Techniques

  • Magnification: Involves increasing the apparent size of an object to assist in observation.
  • Resolution: Refers to the clarity of an image, allowing distinction between two closely placed objects.
  • Light Microscope: Best for viewing thin or transparent samples mounted on slides.
  • Electron Microscope: Capable of examining opaque samples of varying thicknesses at higher resolutions.

Cell Theory

  • Proposed by Schleiden, Schwann, and Virchow, asserting:
    • All living things are composed of cells.
    • Cells represent the basic unit of life.
    • New cells arise from pre-existing cells.

Cell Types

  • Bacteria and Archaea: Represent simpler prokaryotic cell structures.
  • Eukaryotic Cells: Contain a nucleus and ribosomes, involved in cell's genetic control and protein synthesis.

Cellular Organelles

  • Endoplasmic Reticulum: Contributes to the manufacture and transport of molecules; has rough (with ribosomes) and smooth (lipid synthesis) types.
  • Golgi Apparatus: Acts as a processing and shipping center, receiving products from the ER and dispatching them for use or export.
  • Mitochondria: Energy processing organelles found in all cells; chloroplasts are present exclusively in plant cells for photosynthesis.

Structural Components

  • Cytoskeleton: Composed of microtubules, microfilaments, and intermediate filaments; provides structural support and facilitates movement.
  • Plasma Membrane and Cell Wall: The plasma membrane regulates entry and exit of substances, while the cell wall found in plant cells offers protection and shape.
  • Cell Wall: Forms a protective layer composed mainly of cellulose, which provides rigidity and contains plasmodesmata for intercellular communication.

Unique Organelles

  • Lysosomes: Function as the cell's "garbage disposal," digesting cellular waste.
  • Peroxisomes: Involved in metabolic processes, particularly waste management.
  • Centrioles: Not present in plant cells, play a role in cell division.

Ribosomes

  • Free Ribosomes: Reside in the cytoplasm, producing proteins that operate within the cytoplasm.
  • Bound Ribosomes: Attached to the endoplasmic reticulum, synthesizing proteins destined for export from the cell.

Overall Functions

  • Organelles work in harmony for the manufacture, distribution, and breakdown of biomolecules essential for cellular function.

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Description

This quiz covers essential topics related to cellular structures such as the nucleolus, vesicles, lysosomes, and the endomembrane system. Additionally, it delves into the protein synthesis process and various microscopy techniques, including magnification and resolution. Test your understanding of these fundamental biological concepts.

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