Question

What is described as a change in the shape of retinal from 11-cis to 11-trans? A)...

What is described as a change in the shape of retinal from 11-cis to 11-trans?

A) Isomerization

B) Photopigment regeneration

C) Dark current

After exposure to bright light, it takes the _____ longer to adapt to the dark than _____

A) Cones, rods

B) Rods and cones take the same amount of time to adapt to the dark

C) Rods, Cones

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

The right choice is: A (Isomerization)

The retina consists of photoreceptor cells i.e cones and rods. The top area of rods and cones consists of discs which are bound to membrane. This consists of proteins bound to chromophore 11 cis. When light strikes this chromophore then Isomerization takes place which changes the molecular arrangement of 11 cis to 11 trans.

The right choice is: C (Rods, Cones)

Rods adapts slowly and cones adapts fastly when when one comes to dark from bright light because rods are more sensitive to light and the pigments in rods takes time to regenerate and hence takes more time to reach maximum sensitivity. Whereas cones adapts to dark in few minutes.

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