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Questions and Answers
What type of protein is rhodopsin?
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?
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?
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?
Where does chromophore regeneration occur in photoreceptors?
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What is the chemical reaction induced by photon absorption in photoreceptors?
What is the chemical reaction induced by photon absorption in photoreceptors?
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What is the role of G protein, transducin, in phototransduction?
What is the role of G protein, transducin, in phototransduction?
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