Light conves retinene to:: (A) 11 cis, (B) 11 trans, (C) 13 cis, (D) 13 trans
Answer is B. In the dark, the retinene1 in rhodopsin is in the 11-cis configuration. The only action of light is to change the shape of the retinene, conveing it to the all-trans isomer. Ref: Ganong's Review of Medical Physiology 23rd edition, Chapter 12.