6 Questions
What type of protein is rhodopsin?
A G-protein-coupled receptor
What causes the closure of the cGMP-gated Na channels in photoreceptors?
A decrease in intracellular cGMP
What is the final step in phototransduction?
Hyperpolarization of the photoreceptor
Where does chromophore regeneration occur in photoreceptors?
Outer segment
What is the chemical reaction induced by photon absorption in photoreceptors?
Photo-isomerisation of 11-cis-retinal to all-trans-retinal
What is the role of G protein, transducin, in phototransduction?
To activate the cGMP phosphodiesterase
Test your knowledge on the process of chromophore regeneration in photoreceptors, involving photon absorption and isomerisation of retinal. Learn about the binding of 11-cis-retinal to opsins and the role of rhodopsin in phototransduction.
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