How do photoreceptors regenerate inactive cis-retinal?
a. The cell degrades the active form and synthesizes new, inactive proteins.
b. Enzymes convert trans-retinal back to the inactive conformation
c. trans-retinalreverts back to the inactive state on its own.
d. Active trans-retinal is digested by proteases to regenerate the inactive form.
e. The mechanism is not known.
ANSWER: b
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