Cell Biology: Cell Membrane Functions
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Questions and Answers

What is the primary role of the cell membrane in relation to homeostasis?

  • It controls the movement of substances to maintain internal balance. (correct)
  • It synthesizes proteins necessary for cellular function.
  • It acts as a barrier preventing any interaction with the environment.
  • It allows all substances freely to enter and exit.

    • Which of the following is NOT a function of the cell membrane?

  • Providing support and protection for the cell.
  • Controlling what enters and exits the cell.
  • Facilitating cellular communication with other cells.
  • Regulating enzyme reactions within the cell. (correct)

    • What structural feature is characteristic of a cell membrane?

  • A single layer of cholesterol molecules.
  • A porous membrane allowing large molecules to pass through freely.
  • A rigid cell wall surrounding the membrane.
  • A phospholipid bilayer with embedded proteins. (correct)

    • In what way does the cell membrane contribute to the overall function of the cell?

    <p>By controlling the passage of nutrients and waste products.</p> Signup and view all the answers

    Which best describes the composition of the cell membrane?

    <p>Consists of a bilayer of phospholipids with various proteins.</p> Signup and view all the answers

    What is the main structural characteristic of the cell membrane?

    <p>Double layer of phospholipids</p> Signup and view all the answers

    What property distinguishes the phosphate heads from the fatty acid tails in the phospholipid bilayer?

    <p>Phosphate heads are polar, while fatty acid tails are non-polar</p> Signup and view all the answers

    What is the typical thickness range of the cell membrane?

    <p>7.5-10 nanometers</p> Signup and view all the answers

    How do membrane proteins relate to the overall structure of the cell membrane?

    <p>They are embedded within the membrane</p> Signup and view all the answers

    What is the role of the lipid bilayer's arrangement in the cell membrane?

    <p>To separate the aqueous environments inside and outside the cell</p> Signup and view all the answers

    Study Notes

    Cell Membrane Structure and Function

    • All cells have a cell membrane
    • Functions:
      • Controls what enters and exits the cell to maintain internal balance called homeostasis
      • Provides protection and support for the cell
    • Importance of cell membrane:
      • It is a highly selective filter, permits nutrients and leaves the waste products from the cell.
      • Maintains homeostasis
      • Makes cytosol environment to different cells
      • Play an important role in cell to cell communication
      • Its detects Chemical messengers arriving at the cell surface.
    • Types of Transport mechanisms:
      • Passive Transport
        • Diffusion
        • Facilitated Diffusion
        • Osmosis
      • Active Transport
        • Protein Pumps
        • Vesicular/Bulk Transport

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    Description

    Test your knowledge on the functions and structure of the cell membrane. This quiz covers essential concepts related to homeostasis, composition, and the roles of membrane proteins. Understand how the cell membrane contributes to cellular function and maintains stability.

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