Which of these is not a protein?
A. Iodopsin
B. Rhodopsin
C. Opsin
D. Retinal
Answer:D
Which of these is not a protein?
A. Iodopsin B. Rhodopsin C. Opsin D. Retinal
Explanation: Iodopsin and rhodopsin are photosensitive pigments which are proteinaceous in nature. Opsin is also a protein. However, retinal is not a protein. It is an aldehyde of vitamin A.