Photopigments are composed of opsin and which molecule?

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Study for the IMAT Biology Exam with focused multiple-choice questions. Use hints and explanations to enhance your preparation. Get ready for your exam success!

Multiple Choice

Photopigments are composed of opsin and which molecule?

Explanation:
Photopigments in the retina are built from an opsin protein bound to a light-absorbing molecule called retinal. Retinal, a derivative of vitamin A, attaches to opsin to form the functional pigment; when light is absorbed, retinal changes shape (11-cis to all-trans), triggering a cascade that starts the visual signal. The other options don’t fit because opsin is the protein part, melanin is a pigment for protection rather than the chromophore of photopigments, and hemoglobin is the oxygen-carrying molecule in blood.

Photopigments in the retina are built from an opsin protein bound to a light-absorbing molecule called retinal. Retinal, a derivative of vitamin A, attaches to opsin to form the functional pigment; when light is absorbed, retinal changes shape (11-cis to all-trans), triggering a cascade that starts the visual signal. The other options don’t fit because opsin is the protein part, melanin is a pigment for protection rather than the chromophore of photopigments, and hemoglobin is the oxygen-carrying molecule in blood.

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