Cytosine pairs with which base?

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Multiple Choice

Cytosine pairs with which base?

Explanation:
Base pairing in DNA is governed by hydrogen bonding and the need to keep the helix width uniform. Cytosine, a pyrimidine, pairs with guanine, a purine, because this purine–pyrimidine arrangement fits the helix nicely and allows three hydrogen bonds to form between them, giving a strong, stable connection. This pairing contrasts with adenine pairing with thymine, which is a different, two-hydrogen-bond relationship. So cytosine pairs with guanine.

Base pairing in DNA is governed by hydrogen bonding and the need to keep the helix width uniform. Cytosine, a pyrimidine, pairs with guanine, a purine, because this purine–pyrimidine arrangement fits the helix nicely and allows three hydrogen bonds to form between them, giving a strong, stable connection. This pairing contrasts with adenine pairing with thymine, which is a different, two-hydrogen-bond relationship. So cytosine pairs with guanine.

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