Question

Which of these is not a protein?

• A. Trypsin
• B. Collagen
• C. Rubisco
• D. N-acetylglucosamine

Answer 1

The correct option is D N-acetylglucosamine

N-acetylglucosamine is a monosaccharide and derivative of glucose. It is an amide between glucosamine and acetic acid. It has a molecular formula of C${}_8$H${}_{15}$NO${}_6$.

Chitin is a polysaccharide. It is an important component of the cell wall of fungi. It is a long chain polymer of N-acetylglucosamine. It is a modified form of glucose. The bond formed between the glucose molecule is known as glycosidic linkage.

So, the correct answer is option D.