This is the trans isomer of retinal. Where would it be bound to the opsin protein and why?
A) Retinal would be found at the cytosolic side of opsin because it is hydrophilic.
B) Retinal would be found at the cytosolic side of opsin because it is hydrophobic.
C) Retinal would be found in the transmembrane core of opsin because it is hydrophobic.
D) Retinal would be found in the transmembrane core of opsin because it is hydrophilic.

Question

This is the trans isomer of retinal. Where would it be bound to the opsin protein and why? 
A) Retinal would be found at the cytosolic side of opsin because it is hydrophilic. 
B) Retinal would be found at the cytosolic side of opsin because it is hydrophobic. 
C) Retinal would be found in the transmembrane core of opsin because it is hydrophobic. 
D) Retinal would be found in the transmembrane core of opsin because it is hydrophilic.

Quizplus · Accepted Answer

The trans isomer of retinal is a hydrophobic molecule and would be bound in the hydrophobic transmembrane core of the opsin protein. This is where the chromophore group of retinal is embedded, allowing it to undergo conformational changes upon absorption of light and trigger the signal transduction pathway in the visual system.

This Is the Trans Isomer of Retinal