Multiple choice

Which of the following is a non essential amino acid?

  1. Methionine

  2. Lysine

  3. Tryptophan

  4. Cysteine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cysteine, a nonessential amino acid, is one of the 20 building blocks of protein. Cysteine is a part of organic molecules containing an amino group, which can combine in linear arrays to form proteins in living organisms. Cysteine can be synthesized by the body and is not essential to the diet. Its key chemical feature is a thiol group that contains sulfur.

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