Multiple choice

Which of the following amino acids is a nonpolar amino acid?

  1. Methionine

  2. Alanine

  3. Tryptophan

  4. All of the above

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

Methionine, Alanine, and Tryptophan are all nonpolar (hydrophobic) amino acids based on their side chains. Methionine has a sulfur-containing alkyl chain, Alanine has a simple methyl group, and Tryptophan has a bulky indole ring - all are hydrophobic. Therefore, 'All of the above' is the correct answer.