Which molecules combine to form rhodopsin?: (A) Bathorhodopsin and 11-cis-retinal, (B) Bathorhodopsin and all-trans-retinal, (C) Bathorhodopsin and scotopsin, (D) Scotopsin and 11-cis-retinal
Answer is D. Rhodopsin is the light-sensitive chemical in rods. Scotopsin and all-trans retinal are the breakdown products of rhodopsin, which has absorbed light energy. The all-trans retinal is conveed into 11-cis retinal, which can recombine with scotopsin to form rhodopsin