Crossing Membranes Quiz
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Crossing Membranes Quiz

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Questions and Answers

Which type of molecules can diffuse freely across membranes?

  • Charged ions
  • Large polar molecules
  • Large uncharged molecules
  • Small uncharged molecules (correct)

    • What is the major difference between channels and carrier proteins in facilitated diffusion?

  • Channels transport two molecules, while carrier proteins transport one molecule
  • Channels form pores, while carrier proteins undergo a conformational change (correct)
  • Channels require energy (ATP), while carrier proteins do not
  • Channels are highly specific to their solute, while carrier proteins are not

    • What is the function of symporters in facilitated diffusion?

  • Transport two molecules in the same direction (correct)
  • Transport charged ions
  • Transport only large polar molecules
  • Transport two molecules in opposite directions

    • What is the specificity of aquaporins in facilitated diffusion?

    <p>Specific to H2O</p> Signup and view all the answers

    What are the things that open the channel?

    <p>Voltage, ligand, temperature, pressure</p> Signup and view all the answers

    What is the main energy storage molecule and its charge?

    <p>ATP, negative charge</p> Signup and view all the answers

    What converts a chemical signal into the cell for Na+, K+ and Ca2+?

    <p>Ligand-gated ion channels</p> Signup and view all the answers

    What causes depolarization in cell membranes?

    <p>The interior voltage becomes less negative</p> Signup and view all the answers

    What is the function of aquaporins?

    <p>Allow rapid passage of water</p> Signup and view all the answers

    What is the role of voltage-gated sodium channels?

    <p>Transmit signals in a wave through the nervous system</p> Signup and view all the answers

    What is the function of transient receptor potential cation channel subfamily V member 1 (TrpV1)?

    <p>Temperature-gated</p> Signup and view all the answers

    What allows potassium ions to pass but blocks smaller sodium ions?

    <p>Potassium channels</p> Signup and view all the answers

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