Initiation of visual impulse is associated with: (A) Condensation of opsin with vitamin A aldehyde, (B) Photoisomerization and hydrolysis of visual purple, (C) | NADP, (D) | NAD
Answer is B. Ans. (b) Photoisomerization and hydrolysis of visual purple(Ref: Ganong, 25th ed/p. 179)On exposure to light, there is conversion of 11 cis retinal to All trans retinal (photoisomerization) and hydrolysis of visual pigment