Question

Which of the following macromolecules is a protein?

• A. Glycogen
• B. Keratin
• C. Cholesterol
• D. Chitin

Answer 1

Answer: (B)

Keratin

A) Glycogen: It is a multibranched polysaccharide of glucose that serves as a form of energy storage in humans, animals, fungi, and bacteria.

B) Keratin: Keratin is a fibrous structural protein. It is the key structural material which forms hair, horns, claws, hooves, and the outer layer of human skin.

C) Cholesterol: It is a fat-like waxy substance that helps in synthesizing hormones and vitamin D.

D) Chitin: It is a fibrous substance consisting of polysaccharides, which is the major constituent in the exoskeleton of arthropods and the cell walls of fungi.

Hence, the correct answer is 'Keratin'.