Which of the following is an essential amino acid?

Prepare for the Nutrition Section 1 Test. Master nutrition topics through diverse questions, complete with hints and explanations. Get confident for your test!

Multiple Choice

Which of the following is an essential amino acid?

Explanation:
Essential amino acids are those the body cannot make in sufficient amounts and must be obtained from the diet. Histidine falls into this group because the body has limited ability to synthesize it, so it must come from food to support growth and tissue maintenance. The other options—alanine, glycine, and proline—can be produced by the body, so they are considered nonessential. Understanding this helps you see why histidine is the essential one among the choices.

Essential amino acids are those the body cannot make in sufficient amounts and must be obtained from the diet. Histidine falls into this group because the body has limited ability to synthesize it, so it must come from food to support growth and tissue maintenance. The other options—alanine, glycine, and proline—can be produced by the body, so they are considered nonessential. Understanding this helps you see why histidine is the essential one among the choices.

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