N X Chapter 4: Membrane Structure and Function Quiz
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Questions and Answers

What is the main driving force behind diffusion?

  • High temperature
  • Concentration gradient (correct)
  • Molecular size
  • Low concentration gradient

    • In simple diffusion, what factors determine the rate of movement of substances across the membrane?

  • Temperature and pressure
  • Energy requirements and lipid composition
  • Electric charge and polar nature of molecules
  • Molecular size, concentration gradient, and lipid solubility (correct)

    • What type of transport requires the use of energy to move substances across the membrane?

  • Osmosis
  • Facilitated diffusion
  • Active transport (correct)
  • Bulk transport

    • What happens to the rate of diffusion when the concentration gradient is increased?

    <p>Diffusion speeds up</p> Signup and view all the answers

    Which molecules can pass directly through the phospholipid bilayer in simple diffusion?

    <p>Lipid-soluble molecules like CO2 and O2</p> Signup and view all the answers

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