Cell Structures and Functions Module 2
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Questions and Answers

What is the primary composition of the cytosol?

  • Fatty acids and lipid biolayers
  • Water and inorganic molecules (correct)
  • Only organic molecules
  • Proteins and nucleic acids

    • Which of the following correctly differentiates between hydrophobic and hydrophilic substances?

  • Hydrophobic substances can dissolve in fats, while hydrophilic cannot.
  • Both types are attracted to water but differ in solubility.
  • Hydrophobic substances repel water, while hydrophilic substances attract water. (correct)
  • Hydrophobic substances are water-attracting, while hydrophilic are not.

    • In what way do permeable and impermeable membranes differ?

  • Permeable membranes are not affected by pressure, while impermeable are.
  • Both types allow only small molecules to pass but vary in size.
  • Permeable membranes selectively allow substances to pass, impermeable membranes block all. (correct)
  • Permeable membranes allow all substances to pass while impermeable do not allow any.

    • What is a function of one type of cytoskeleton?

    <p>To maintain cell shape and enable movement</p> Signup and view all the answers

    What is the primary use of the cell wall?

    <p>To provide structural support and protection</p> Signup and view all the answers

    What type of organelles are surrounded by a phospholipid bilayer?

    <p>Membrane-bound organelles</p> Signup and view all the answers

    Which protein constitutes microtubules?

    <p>Tubulin</p> Signup and view all the answers

    What is the primary role of intermediate filaments?

    <p>Maintain cell shape and anchor the nucleus</p> Signup and view all the answers

    Which cytoskeletal structure is involved in the movement of organelles and chromosomes?

    <p>Microtubules</p> Signup and view all the answers

    What is the main feature of the plasma membrane that ensures selective permeability?

    <p>Phospholipid bilayer arrangement</p> Signup and view all the answers

    What is the primary function of the cytoskeleton?

    <p>Provides structural support and facilitates movement</p> Signup and view all the answers

    Which organelles are compared for their role in energy provision?

    <p>Chloroplasts and mitochondria</p> Signup and view all the answers

    Where are subcellular structures suspended within the cell?

    <p>Cytoplasm</p> Signup and view all the answers

    Study Notes

    Cell Structures and Functions Overview

    • Key learning objectives include distinguishing plasma membrane components, comparing cytoskeletal structures, and understanding organelle functions.
    • Focus areas include the structure and function of cellular components and how they contribute to cellular operations.

    Major Parts of the Cell

    • Membrane-bound Organelles: Enclosed by a phospholipid bilayer, providing compartmentalization.
    • Non-membrane-bound Organelles: Lack a membrane, directly interacting with the cytosol.

    Plasma Membrane

    • Exhibits selective permeability, regulating the movement of molecules into and out of the cell.
    • Composed of a phospholipid bilayer, proteins embedded within perform various functions including transport and signaling.

    Cytoskeleton

    • A network of protein fibers that provides structural support and maintains cell shape.
    • Functions include facilitating movement of organelles, macromolecules, and chromosomes.

    Types of Cytoskeletal Components

    • Microtubules: Made of tubulin, they originate from centrosomes and form spindle fibers during cell division.
    • Microfilaments: Composed of actin, aiding in cell and organelle movement; involved in changing cell shape.
    • Intermediate Filaments: Provide mechanical support, maintain cell shape, and anchor the nucleus.

    Cytoplasm

    • Contains all subcellular structures suspended in cytosol, a fluid mixture of water, inorganic, and organic substances.

    Cell Wall

    • Provides structural support and protection, primarily found in plant cells.

    Genetic Control of the Cell

    • Involves the nucleus and ribosomes, which play critical roles in gene expression and protein synthesis.

    Endomembrane System

    • A complex system of membranes that includes organelles such as the endoplasmic reticulum and Golgi apparatus, facilitating protein and lipid synthesis.

    Energy Houses of the Cells

    • Mitochondria: Generate ATP through cellular respiration, known as the powerhouse of the cell.
    • Chloroplasts: Found in plants, conduct photosynthesis to convert solar energy into chemical energy.

    Checkpoint Questions

    • Define major cell components and their functions.
    • Differentiate between hydrophobic and hydrophilic substances.
    • Distinguish between permeable and impermeable substances.
    • Explain the function of specific cytoskeletal components.
    • Describe the role of the cell wall in maintaining cell integrity.

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    Quiz Team

    Description

    This quiz covers key concepts from Module 2 on cell structures and their functions. Students will explore the components of plasma membranes, the roles of microfilaments, intermediate filaments, microtubules, and the function of the cell wall. Additionally, the quiz delves into the composition and role of the nucleus and ribosomes in genetic control.

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