An essential amino acid must be obtained from the diet.

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Multiple Choice

An essential amino acid must be obtained from the diet.

Explanation:
An essential amino acid must come from the diet because it cannot be made in adequate amounts by the body. Histidine is one of these essential amino acids, needed for growth and tissue repair, so it must be obtained from food. The other amino acids listed—alanine, glycine, and proline—can be synthesized by the body, so they are considered nonessential.

An essential amino acid must come from the diet because it cannot be made in adequate amounts by the body. Histidine is one of these essential amino acids, needed for growth and tissue repair, so it must be obtained from food. The other amino acids listed—alanine, glycine, and proline—can be synthesized by the body, so they are considered nonessential.

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