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In the chemistry of vision in mammals, the photosensitive substance is called:

1. sclerotin
2. retinol
3. rhodopsin
4. melanin

Correct answer: rhodopsin

Solution

Rhodopsin is the light-sensitive pigment in rod cells of the retina, so it is the substance directly involved in vision chemistry in mammals. Retinol is vitamin A, melanin is a general pigment, and sclerotin is not the visual photopigment.

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