How Do Photoreceptors Regenerate Inactive Cis -Retinal

question 74

Multiple Choice

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 -retinal reverts 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.

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