Question

which of the following is a nonessential amino acid?
o histidine
o tryptophan
o serine
o valine

Explanation:

Non - essential amino acids are those that the body can synthesize on its own. Serine is a non - essential amino acid. Histidine, tryptophan, and valine are essential amino acids which the body cannot synthesize and must be obtained from the diet.

Answer:

Serine