Multiple choice

Consider the following statements: Keratin is

  1. a protein.
  2. a hormone.
  3. present in hair.
  4. present in nails. Which of these statements are correct?

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 1, 3 and 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Keratin is a fibrous structural protein that is the key structural material for making up hair, nails, horns, feathers, and the outer layer of human skin. It is not a hormone - hormones are chemical signaling molecules. Keratin provides mechanical protection and is responsible for the strength and toughness of these structures.

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