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Rhodospin is a combination of opsin and _______

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Rhodospin is a combination of opsin and _______

(a) 11-cis-retinal

(b) 10-cis-retinal

(c) 11-trans-retinal

(d) 10-trans-retinal

This question was posed to me in an international level competition.

I want to ask this question from The Photochemistry of Vision in portion Photochemistry of Engineering Chemistry I

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Correct choice is (a) 11-cis-retinal

Easy explanation: Rhodospin is a combination of opsin and 11-cis-retinal. Opsin is a protein and it is colorless. 11-cis-retinal is highly conjugated aldehyde.

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