What photopigments are used by rods and cones?

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Multiple Choice

What photopigments are used by rods and cones?

Explanation:
Rods and cones use different photopigments that define how they detect light. Rods rely on rhodopsin, a photopigment in the rod outer segments that is extremely sensitive and supports vision in very dim light. Cones, on the other hand, contain cone opsins—three types designated S, M, and L—that absorb different wavelengths and together enable color vision and sharper detail in bright light. This combination underlies why humans have trichromatic color perception. So the best match is rods with rhodopsin and cones with cone opsins (S, M, L). The other options mix up the pigments or include non-photopigment proteins like melanin or CRALBP, which are not photopigments.

Rods and cones use different photopigments that define how they detect light. Rods rely on rhodopsin, a photopigment in the rod outer segments that is extremely sensitive and supports vision in very dim light. Cones, on the other hand, contain cone opsins—three types designated S, M, and L—that absorb different wavelengths and together enable color vision and sharper detail in bright light. This combination underlies why humans have trichromatic color perception.

So the best match is rods with rhodopsin and cones with cone opsins (S, M, L). The other options mix up the pigments or include non-photopigment proteins like melanin or CRALBP, which are not photopigments.

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