Photoreceptor Chromophore Regeneration Quiz
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Photoreceptor Chromophore Regeneration Quiz

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@ProductiveDrama

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Questions and Answers

What type of protein is rhodopsin?

  • A cytosolic protein
  • An enzyme
  • A G-protein-coupled receptor (correct)
  • A transmembrane protein

    • What causes the closure of the cGMP-gated Na channels in photoreceptors?

  • An increase in intracellular cGMP
  • A decrease in intracellular cGMP (correct)
  • A decrease in intracellular Ca2+
  • An increase in intracellular Ca2+

    • What is the final step in phototransduction?

  • Activation of rhodopsin
  • Hyperpolarization of the photoreceptor (correct)
  • Binding and activation of the G protein, transducin
  • Closure of cGMP-gated Na channels

    • Where does chromophore regeneration occur in photoreceptors?

    <p>Outer segment</p> Signup and view all the answers

    What is the chemical reaction induced by photon absorption in photoreceptors?

    <p>Photo-isomerisation of 11-cis-retinal to all-trans-retinal</p> Signup and view all the answers

    What is the role of G protein, transducin, in phototransduction?

    <p>To activate the cGMP phosphodiesterase</p> Signup and view all the answers

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