SAT Subject Biology Practice Question 162: Answer and Explanation

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Question: 162

12. Which type of bond is broken by the helicase enzyme?

I. Covalent bonds

II. Hydrogen bonds

III. Ionic bonds

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

Correct Answer: B

Explanation:

Helicase separates the complementary strands of DNA, which are attached by hydrogen bond interactions between purines and pyrimidines.

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