How many hydrogen bonds form between adenine and thymine in DNA?

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Multiple Choice

How many hydrogen bonds form between adenine and thymine in DNA?

Explanation:
Adenine and thymine in DNA connect with two hydrogen bonds. One bond forms between adenine’s amino group and thymine’s carbonyl oxygen, and the second bond forms between thymine’s N3–H and adenine’s N1. This two-bond pairing provides the specific, stable interaction that fits the DNA double helix geometry. By comparison, guanine–cytosine pairs form three hydrogen bonds, making GC pairs more stable.

Adenine and thymine in DNA connect with two hydrogen bonds. One bond forms between adenine’s amino group and thymine’s carbonyl oxygen, and the second bond forms between thymine’s N3–H and adenine’s N1. This two-bond pairing provides the specific, stable interaction that fits the DNA double helix geometry. By comparison, guanine–cytosine pairs form three hydrogen bonds, making GC pairs more stable.

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