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Answer: 2. Opsin and Retinal

Key idea: The photosensitive pigment of the eye, rhodopsin (visual purple), is made of opsin (a protein) and retinal (an aldehyde of vitamin A).

Light changes retinal from the 11-cis to the all-trans form, which alters opsin and starts the nerve impulse. Retinol is the alcohol form, not part of the pigment, and transducin is a G protein in the signal chain.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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