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Question

Dark adaptation in human eye involves
  1. Conversion of 11 cis retinene to trans retinene
  2. Conversion of trans retinene to cis retinene
  3. Decomposition of rhodopsin into retinene
  4. Decomposition of rhodopsin to scotopsin.

A
Decomposition of rhodopsin to scotopsin.
B
Conversion of trans retinene to cis retinene
C
Conversion of 11 cis retinene to trans retinene
D
Decomposition of rhodopsin into retinene
Solution
Verified by Toppr

Retinine exist in two forms, different in molecular shape they are, cis retinine and trans retinine. 11-cis Retinal is the light-sensitive component of rod and cone photoreceptors. In the first step of vision, photoreceptors are activated when light induces the isomerization of 11-cis retinal to all-trans retinal. In the dark, trans retinene changes to cis retinene and joins opsin once more to form the rhodopsin.
So, the correct answer is option B.

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