Answers PA Human Anatomy Physiology A 2026-2027 SMITH IC Proteins and Nucleic AcidsQuestion 20

20

QuizMultiple Choice

Proteins and Nucleic Acids

Question 20 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC

Which pair of statements best describes an essential amino acid?

Answer

A

It is an amino acid that contains peptide bonds. An example is proline.

B

It is an amino acid that contains nitrogen. An example is aspartic acid.

C

It is an amino acid that cannot be made by the body. It must be obtained from eating certain foods.

D

It is an amino acid that can be produced by the body. Vitamin supplements maintain healthy levels.

Explanation

An essential amino acid is one the body cannot make in sufficient amounts, so it must come from food. Choice C gives this definition. The other choices describe general amino-acid features or incorrectly say the body can produce the amino acid.

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