Multiple choice

Which one of the following is a protein?

  1. Ppsin

  2. Carotene

  3. Keratin

  4. Progesterone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Keratin is a fibrous structural protein that makes up the outer layer of human skin, hair, and nails. Carotene is a pigment, progesterone is a steroid hormone, and "Ppsin" appears to be a typo for pepsin (which is also an enzyme/protein, but misspelled here).

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