Which of the following amino acids is among the essential amino acids for adult humans?

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Multiple Choice

Which of the following amino acids is among the essential amino acids for adult humans?

Explanation:
Essential amino acids for adults are those the body cannot synthesize and must obtain from the diet. Leucine is one of these essential amino acids, so it must come from food. The other listed amino acids can be made by the body: glycine and proline are nonessential, and glutamine is synthesized as well and is mostly considered conditionally essential only under stress. Therefore leucine fits the requirement for an essential amino acid in healthy adults.

Essential amino acids for adults are those the body cannot synthesize and must obtain from the diet. Leucine is one of these essential amino acids, so it must come from food. The other listed amino acids can be made by the body: glycine and proline are nonessential, and glutamine is synthesized as well and is mostly considered conditionally essential only under stress. Therefore leucine fits the requirement for an essential amino acid in healthy adults.

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