Multiple choice

Amino acids are the building blocks of proteins. Which among the following is an amino acid?

  1. Indole

  2. Pyrrole

  3. Tryptophan

  4. Serotonin

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

Tryptophan is one of the 20 standard amino acids, as well as an essential amino acid in the human diet. It is encoded in the standard genetic code as the codon UGG.