What photopigment is found in rods and what are its components?

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Multiple Choice

What photopigment is found in rods and what are its components?

Explanation:
Rods use rhodopsin as their photopigment, which is a protein (opsin) bound to a light-sensitive chromophore, 11-cis-retinal. In the dark this 11-cis-retinal is tucked into the opsin. When a photon is absorbed, it isomerizes to all-trans-retinal, activating the pigment and triggering the downstream signal cascade. The bound chromophore is then regenerated back to 11-cis-retinal for continued sensitivity. This combination—rhodopsin with 11-cis-retinal bound to opsin—is what characterizes the rod pigment.

Rods use rhodopsin as their photopigment, which is a protein (opsin) bound to a light-sensitive chromophore, 11-cis-retinal. In the dark this 11-cis-retinal is tucked into the opsin. When a photon is absorbed, it isomerizes to all-trans-retinal, activating the pigment and triggering the downstream signal cascade. The bound chromophore is then regenerated back to 11-cis-retinal for continued sensitivity. This combination—rhodopsin with 11-cis-retinal bound to opsin—is what characterizes the rod pigment.

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