Cell Membrane and Equilibrium in Diffusion
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Questions and Answers

What is the term used to describe the movement of molecules across the cell membrane without requiring cellular energy?

  • Endocytosis
  • Passive transport (correct)
  • Facilitated diffusion
  • Active transport
  • At equilibrium, what happens to the concentration of the substance on both sides of the cell membrane?

  • It remains the same (correct)
  • It decreases
  • It becomes zero
  • It increases
  • What type of molecules pass through cell membranes most easily due to their properties?

  • Nucleic acids
  • Large and charged ions
  • Proteins
  • Small and uncharged molecules (correct)
  • How do proteins in the cell membrane facilitate the movement of certain molecules?

    <p>By acting as carriers or channels</p> Signup and view all the answers

    Which type of transport involves the use of special protein carriers to help molecules move across the membrane?

    <p>Facilitated diffusion</p> Signup and view all the answers

    What is the term used to describe the movement of molecules across the cell membrane without requiring cellular energy?

    <p>Passive transport</p> Signup and view all the answers

    Why do small and uncharged molecules pass through cell membranes most easily?

    <p>Because they can dissolve in the lipid environment of the membrane.</p> Signup and view all the answers

    How do proteins in the cell membrane help facilitate the movement of certain molecules?

    <p>By acting as carriers or channels.</p> Signup and view all the answers

    What happens at equilibrium in terms of the concentration of a substance on both sides of the cell membrane?

    <p>The concentration of the substance is the same on both sides of the membrane.</p> Signup and view all the answers

    Why do some large molecules and charged ions seem to pass through cell membranes quickly?

    <p>Due to protein carriers or channels in the membrane.</p> Signup and view all the answers

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