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Question
In the chemistry of vision in mammals, the photosensitive substance is called _____.
In the chemistry of vision in mammals, the photosensitive substance is called _____.
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Solution
The correct option is A Rhodopsin
Photosensitive means sensitive to light. The rod cells of retina contain a purplish pigment called rhodopsin. They function in dim light and at night. Rhodopsin consists of a protein component, opsin, linked to a nonprotein chromophore, retinal (or retinene), a derivative of vitamin A. Light falling on the rod is absorbed by the retinal, which changes its form. This initiates the transmission of a nerve impulse to the brain. Retinol is the another name of vitamin A. Deficiency of this affects the eyes, causing night blindness and xerophthalmia. Melanin is a pigment that gives colour to the eyes, skin and hair in vertebrates.
Rhodopsin
Photosensitive means sensitive to light. The rod cells of retina contain a purplish pigment called rhodopsin. They function in dim light and at night. Rhodopsin consists of a protein component, opsin, linked to a nonprotein chromophore, retinal (or retinene), a derivative of vitamin A. Light falling on the rod is absorbed by the retinal, which changes its form. This initiates the transmission of a nerve impulse to the brain. Retinol is the another name of vitamin A. Deficiency of this affects the eyes, causing night blindness and xerophthalmia. Melanin is a pigment that gives colour to the eyes, skin and hair in vertebrates.
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