In DNA, the base pair held together by three hydrogen bonds is ___.

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Multiple Choice

In DNA, the base pair held together by three hydrogen bonds is ___.

Explanation:
Base pairing in DNA is stabilized by hydrogen bonds between complementary bases. Adenine pairs with thymine using two hydrogen bonds, while guanine pairs with cytosine using three hydrogen bonds. The pair held together by three hydrogen bonds is cytosine and guanine. This extra bond makes GC-rich regions more thermally stable and contributes to a higher melting temperature. Note that uracil is found in RNA (where it pairs with adenine), not in DNA, so a guanine–uracil pairing isn’t a standard DNA base pair.

Base pairing in DNA is stabilized by hydrogen bonds between complementary bases. Adenine pairs with thymine using two hydrogen bonds, while guanine pairs with cytosine using three hydrogen bonds. The pair held together by three hydrogen bonds is cytosine and guanine. This extra bond makes GC-rich regions more thermally stable and contributes to a higher melting temperature. Note that uracil is found in RNA (where it pairs with adenine), not in DNA, so a guanine–uracil pairing isn’t a standard DNA base pair.

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