Which base pairs with cytosine?

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Multiple Choice

Which base pairs with cytosine?

Explanation:
Base pairing is determined by complementary hydrogen bonding patterns between bases. Cytosine forms three hydrogen bonds with guanine, giving a stable GC pairing. This pairing occurs in DNA and also in RNA contexts where cytosine pairs with guanine; adenine pairs with thymine in DNA (or uracil in RNA), not with cytosine. Uracil pairs with adenine, not cytosine, and cytosine pairing with cytosine isn’t used because it wouldn’t provide the proper complementary geometry and bonding. So the base that pairs with cytosine is guanine.

Base pairing is determined by complementary hydrogen bonding patterns between bases. Cytosine forms three hydrogen bonds with guanine, giving a stable GC pairing. This pairing occurs in DNA and also in RNA contexts where cytosine pairs with guanine; adenine pairs with thymine in DNA (or uracil in RNA), not with cytosine. Uracil pairs with adenine, not cytosine, and cytosine pairing with cytosine isn’t used because it wouldn’t provide the proper complementary geometry and bonding. So the base that pairs with cytosine is guanine.

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