During the dark phase of visual cycle, which form of vitamin A combines with opsin to make Rhodopsin:: (A) All trans-Retinaldehyde, (B) all trans-Retinol, (C) 11-cis-Retinaldehyde, (D) 11-cis-Retinol
Answer is C. Ans. C. 11-cis-RetinaldehydeFirst know about the forms of Vitamin Aa. Retinol: A primary alcohol containing a bionone ring with an unsaturated side chain.b. Retinal: It is an aldehyde which is derived from the oxidation of alcohol. It can exist in two formsi. 11-cis retinalii. 11-trans retinalc. Retinoic acid The acid derived from oxidation of retinal(Oxidation) (Oxidation)Retinol -------- Retinal ---------- Retinoic acid(Retinaldehyde)