Of the listed amino acids, which one is not an essential amino acid?
  1. Methionine
  2. Leucine
  3. Lysine
  4. Alanine
Explanation
ANSWER: D - Alanine is the listed amino acid which is not an essential amino acid. The essential amino acids are valine, leucine, isoleucine, threonine, lysine, histidine, phenylalanine, tryptophan and methionine.
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