Question: a nonessential amino acid is one that?
Answer: Medical Definition of Amino acid, nonessential Amino acid, nonessential: An amino acid that can be made by humans and so is not essential to the human diet. There are 11 nonessential amino acids: alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine.