Cytosine pairs with which base?

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Multiple Choice

Cytosine pairs with which base?

Explanation:
Base-pairing rules determine which bases pair across the two strands. Cytosine pairs with guanine because C is a pyrimidine and G is a purine; they form three hydrogen bonds, which gives strong, specific pairing and keeps the helix width uniform. In DNA, adenine pairs with thymine; in RNA, adenine pairs with uracil, but cytosine always pairs with guanine. So cytosine's partner is guanine, not adenine, thymine, or uracil.

Base-pairing rules determine which bases pair across the two strands. Cytosine pairs with guanine because C is a pyrimidine and G is a purine; they form three hydrogen bonds, which gives strong, specific pairing and keeps the helix width uniform. In DNA, adenine pairs with thymine; in RNA, adenine pairs with uracil, but cytosine always pairs with guanine. So cytosine's partner is guanine, not adenine, thymine, or uracil.

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