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Passive and Active Transport in Cells Quiz
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Passive and Active Transport in Cells Quiz

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Questions and Answers

What type of molecules move through the lipid bilayer membrane in simple diffusion?

  • Large polar molecules
  • Charged ions
  • Proteins
  • Small non-polar molecules (correct)
  • In active transport, what type of transport is linked to the hydrolysis of ATP or a high energy molecule?

  • Secondary
  • Simple
  • Primary (correct)
  • Facilitated
  • What drives secondary active transport across the membrane?

  • Facilitated diffusion
  • Concentration gradient
  • ATP hydrolysis
  • H+ gradient (correct)
  • What is the main factor that determines the rate at which molecules diffuse across a membrane?

    <p>Concentration difference</p> Signup and view all the answers

    Which molecule is more likely to undergo rapid diffusion across a membrane?

    <p>Molecule with high solubility in lipid</p> Signup and view all the answers

    What happens to the concentration of a diffusing substance on either side of the membrane after simple diffusion?

    <p>It becomes the same on both sides</p> Signup and view all the answers

    What type of molecules is simple diffusion primarily feasible for?

    <p>Non-polar molecules</p> Signup and view all the answers

    Which integral membrane proteins act as selective gates for certain molecules during facilitated diffusion?

    <p>Carrier molecules</p> Signup and view all the answers

    What type of flow from high to low concentration is thermodynamically favorable during simple diffusion?

    <p>Unidirectional flow</p> Signup and view all the answers

    Which proteins assist in increasing the rate of transport via facilitated diffusion?

    <p>Integral membrane proteins</p> Signup and view all the answers

    What is the primary function of aquaporins in facilitated transport through pores?

    <p>Enhance water transport</p> Signup and view all the answers

    What structural feature in aquaporins prevents protons from entering the channel during water transport?

    <p>Conserved His180 and R195 residues</p> Signup and view all the answers

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