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Cell Membrane Structure and Protein Functions Quiz
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Cell Membrane Structure and Protein Functions Quiz

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Questions and Answers

What is the fluid-mosaic model?

  • Membranes consist of a mosaic of diverse protein molecules embedded within a fluid phospholipid bilayer. (correct)
  • Membranes consist of a single layer of protein molecules within a fluid phospholipid bilayer.
  • Membranes are composed of a single type of protein embedded within a rigid phospholipid bilayer.
  • Membranes are composed of a rigid layer of protein molecules within a fluid phospholipid bilayer.
  • What are the 6 main functions of proteins in cell membranes?

  • Maintain cell shape, coordinate changes inside and outside the cell, act as receptors for chemical messengers, catalyze reactions. (correct)
  • Maintain cell shape, store genetic information, catalyze reactions, transport materials across the membrane.
  • Maintain cell shape, store genetic information, act as receptors for chemical messengers, transport materials across the membrane.
  • Maintain cell shape, coordinate changes inside and outside the cell, act as energy storage, act as hormones.
  • What does it mean when some cell membranes are selectively permeable?

  • They allow only water to pass through.
  • They allow some substances to cross more easily than others and block the passage of some substances altogether. (correct)
  • They allow all substances to cross equally.
  • They block the passage of all substances.
  • What is diffusion and how does it differ from active transport?

    <p>Diffusion is the movement of a substance down its concentration gradient and is passive.</p> Signup and view all the answers

    What is facilitated diffusion? Does it require energy?

    <p>Facilitated diffusion is the passive transport of a substance across a membrane and doesn't require energy.</p> Signup and view all the answers

    Study Notes

    Cell Membranes

    • The fluid-mosaic model describes the structure of cell membranes, which consist of a phospholipid bilayer with embedded proteins, allowing for selective permeability.

    Protein Functions in Cell Membranes

    • Proteins in cell membranes perform six main functions:
      • Receptors for signal transduction
      • Enzymes for catalyzing chemical reactions
      • Transporters for moving molecules across the membrane
      • Cell-cell recognition and adhesion
      • Anchoring the cytoskeleton
      • Cell signaling and communication

    Selective Permeability

    • Selectively permeable cell membranes allow certain molecules to pass through while restricting others, maintaining internal cellular conditions.

    Diffusion and Active Transport

    • Diffusion is the passive movement of molecules from an area of high concentration to an area of low concentration, resulting in uniform distribution.
    • Active transport, in contrast, is the energy-dependent movement of molecules against their concentration gradient, often requiring ATP.

    Facilitated Diffusion

    • Facilitated diffusion is a type of passive transport in which molecules move down their concentration gradient with the assistance of transport proteins, but does not require energy input.

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    Description

    Test your knowledge of the fluid-mosaic model and the main functions of proteins in cell membranes with this Biology Chapter 5 Exam Review Quiz. Brush up on your understanding of membrane structure and protein functions in cell biology.

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