Which of the following is a component of the visual pigment rhodopsin: (A) β-carotene, (B) Retinal, (C) Retinol, (D) Retinoic acid
Answer is B. In the retina, retinal (retinaldehyde) functions as the prosthetic group of light-sensitive opsin proteins, forming rhodopsin (in rods) and iodopsin (in cones).