Membrane Transport Mechanisms Quiz
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Questions and Answers

What is the primary characteristic of facilitated diffusion?

  • Relies on a finite number of carrier proteins (correct)
  • Involves movement from low to high concentration
  • Moves substances against a concentration gradient
  • Requires energy input

    • Which statement is true about primary active transport?

  • It involves movement of substances from low to high concentration
  • It primarily relies on ion concentration gradients for transport
  • All carriers act as enzymes with ATPase activity (correct)
  • It requires a concentration gradient for movement

    • What is the function of the Na+-K+-ATPase pump?

  • Transports 2 Na+ out of the cell and 3 K+ into the cell
  • Relies on passive diffusion for ion transport
  • Creates a positive charge inside the cell compared to the outside
  • Establishes a chemical potential difference between ECF and ICF (correct)

    • What is a distinguishing feature of secondary active transport?

    <p>Movement of molecules in opposite directions</p> Signup and view all the answers

    Which factor does NOT contribute to an increase in the rate of facilitated diffusion?

    <p>Higher molecular size</p> Signup and view all the answers

    What happens at high extracellular fluid concentrations during facilitated diffusion?

    <p>The rate of diffusion decreases due to carrier saturation</p> Signup and view all the answers

    What is the main characteristic of molecules that undergo facilitated diffusion?

    <p>Polar and any size molecule</p> Signup and view all the answers

    In facilitated diffusion, how do substances move across the membrane?

    <p>Against the concentration gradient with the help of carrier proteins</p> Signup and view all the answers

    Which type of transport involves moving substances against their concentration gradient?

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

    What is a common example of primary active transport?

    <p>Na+/K+ ATPase pump</p> Signup and view all the answers

    What type of molecules are typically transported through active carrier-mediated transport?

    <p>Polar and any size molecule</p> Signup and view all the answers

    What is the major difference between facilitated diffusion and active transport?

    <p>Facilitated diffusion requires energy, while active transport does not.</p> Signup and view all the answers

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