Multiple choice

Which one of the following is not an amino acid?

  1. Glycine

  2. Lysine

  3. Tryptophan

  4. Uracil

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glycine, lysine, and tryptophan are amino acids. Uracil is a nitrogenous base found in RNA, not an amino acid.