What is the Chromophore Group in Bacteriorhodopsin

Question

What is the chromophore group in bacteriorhodopsin?
A) tocopherol
B) β-carotene
C) folic acid
D) retinal
E) chlorophyll

Accepted Answer

The chromophore group in bacteriorhodopsin is retinal. It is a covalently bound prosthetic group responsible for the absorption of light in the protein.