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Biology Chapter 1: Cell Membrane Transport
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Biology Chapter 1: Cell Membrane Transport

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Questions and Answers

Which of the following is TRUE about passive transport?

  • It involves simple diffusion (correct)
  • It involves active transport
  • It requires energy
  • It is limited to macromolecules
  • What are two pathways for passing through the cell membrane by simple diffusion?

    Diffusion through lipid bilayer and diffusion through protein channels

    Passive diffusion requires energy to occur.

    False

    Which of the following substances can pass through the cell membrane via simple diffusion through the lipid bilayer?

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

    Name one macromolecule transport method.

    <p>Endocytosis or Exocytosis</p> Signup and view all the answers

    Study Notes

    Transport across Cell Membrane

    • Transport mechanisms for molecules are categorized into small (micro) and large (macromolecules).

    Transport of Small Molecules

    • Passive Transport:
      • No energy required for movement across the cell membrane.

    a- Passive Diffusion

    • Involves movement of molecules from high to low concentration.

    • Simple Diffusion:

      • Molecules passively traverse the cell membrane through two main pathways:
        • Diffusion through Lipid Bilayer:
          • Lipid-soluble substances can easily dissolve in the bilayer, e.g., ( O_2 ), ( N_2 ), and alcohols.
          • Water also diffuses due to its small molecular size and high kinetic energy.
        • Diffusion through Protein Channels:
          • Charged particles, such as ( Na^+ ) and ( K^+ ), move through specialized protein channels.
          • Larger molecules like glucose cannot pass through the lipid bilayer without assistance.

    Active Transport

    • Requires energy (usually ATP) to move substances against their concentration gradient.

    Transport of Large Molecules

    • Large molecules and particles are transported via bulk transport mechanisms.

    • Endocytosis:

      • Process of engulfing substances into the cell by wrapping them in the membrane.
    • Exocytosis:

      • Mechanism for expelling materials from the cell by vesicle fusion with the plasma membrane.

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    Description

    Explore the mechanisms of transport across cell membranes in this quiz, which covers both small and large molecules. Learn about passive and active transport processes, including simple diffusion, facilitated diffusion, endocytosis, and exocytosis. Test your understanding of key concepts in cell biology.

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