Question

Which of the following proteins is a constituent of nails, hair and feathers?

• A. Keratan sulphate
• B. Keratin
• C. Collagen
• D. Elastin

Answer 1

The correct option is B

Keratin

Keratin a fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc.
Collagen is the main structural protein found in skin and other connective tissues.
Elastin is a highly elastic protein in connective tissue and allows many tissues in the body to resume their shape after stretching or contracting.
Keratan sulfate is a sulphated structural carbohydrate that have been found especially in the cornea, cartilage, and bone. Keratan sulfates are large, highly hydrated molecules which in joints can act as a cushion to absorb mechanical shock.