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Retinal is a derivative of vitamin A. Retinal is a polyene chromophore, and bound to proteins called opsins, is the chemical basis of animal vision. Bound to proteins called type 1 rhodopsins, retinal allows certain microorganisms to convert light into metabolic energy.

1. Retinal is a derivative of vitamin B.
2. Retinal is a derivative of vitamin C.
3. Retinal is a derivative of vitamin A.
4. Retinal is a derivative of vitamin D.

Correct answer: Retinal is a derivative of vitamin A.

Solution

Retinal is an aldehyde form derived from vitamin A, and it combines with opsins to form visual pigments. That is why the correct choice is the one identifying it as a vitamin A derivative.

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