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Which of the following statements is correct?

1. Adenine pairs with thymine through one H-bond
2. Adenine pairs with thymine through three H-bonds
3. Adenine does not pair with thymine
4. Adenine pairs with thymine through two H-bonds

Correct answer: Adenine pairs with thymine through two H-bonds

Solution

In DNA, adenine pairs specifically with thymine, and this pair is stabilized by two hydrogen bonds. The three-hydrogen-bond pairing belongs to guanine and cytosine.

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