SAT Subject Biology Practice Question 161: Answer and Explanation

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Question: 161

11. Which can affect the primary structure of a protein?

I. Genetic mutation

II. Increase in temperature

III. Decrease in pH

A. I only
B. I and II
C. I and III
D. II and III
E. I, II, and III

Correct Answer: A


The primary structure of a protein refers to its amino acid sequence. This can only be altered by a genetic mutation. Changes in pH or temperature may alter the secondary or higher-level structure of the protein.

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