Multiple choice

Which of the following is an essential amino acid?

  1. Tryptophan

  2. Isoleucine

  3. Phenylalanine

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tryptophan, isoleucine, and phenylalanine are all essential amino acids that humans cannot synthesize and must obtain from their diet. Therefore, all of the listed options are correct.

Keep practicing — related questions