SAT Subject Biology Practice Question 257: Answer and Explanation

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Question: 257

7. Which of the following is a macromolecule composed of amino acid subunits?

A. Amylase
B. Glycogen
C. Phospholipid
D. Polysaccharide
E. Ribonucleic acid

Correct Answer: A

Explanation:

Amylase, an enzyme found in saliva, is a protein. It is therefore composed of amino acids.

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