The opsin component of channelrhodopsin is an integral membr

The opsin component of channelrhodopsin is an integral membrane protein. Which of the following statements about the opsin component is correct?

A.The primary amino acid sequence contains 5 highly hydrophobic regions

B.A conformational change in the opsin activates other proteins in a signalling pathway

C.The protein is translated on free ribosomes in the cytoplasm

D.The protein can be activated by light immediately after translation

Solution

B.A conformational change in the opsin activates other proteins in a signalling pathway

Explanation:

The absorption of a photon of light by opsin results in the photoisomerization causing conformational change which in turn activates the opsin and triggers phototransduction cascade.