Which base always pairs with cytosine?

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Multiple Choice

Which base always pairs with cytosine?

Explanation:
The pairing rule for DNA bases is specific: cytosine always pairs with guanine. They form three hydrogen bonds, which helps keep the double helix width uniform and provides stability during replication. So the partner for cytosine is guanine. Adenine pairs with thymine (or uracil in RNA), not cytosine, and a cytosine–cytosine pairing isn’t part of standard Watson–Crick base pairing.

The pairing rule for DNA bases is specific: cytosine always pairs with guanine. They form three hydrogen bonds, which helps keep the double helix width uniform and provides stability during replication. So the partner for cytosine is guanine. Adenine pairs with thymine (or uracil in RNA), not cytosine, and a cytosine–cytosine pairing isn’t part of standard Watson–Crick base pairing.

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