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The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eye, is a derivative of:

1. vitamin B1
2. vitamin C
3. vitamin D
4. vitamin A

Correct answer: vitamin A

Solution

Rhodopsin in rod cells contains retinal, the aldehyde form of vitamin A. Because retinal is derived from vitamin A, the pigment depends on this vitamin for formation and function in low-light vision.

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