Which base pairing is correct in DNA?

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Multiple Choice

Which base pairing is correct in DNA?

Explanation:
DNA base pairing is highly specific: adenine forms two hydrogen bonds with thymine, and guanine forms three hydrogen bonds with cytosine. This complementary pairing underpins the double-helix structure and accurate DNA replication, with A pairing with T and G pairing with C. In DNA, thymine is used rather than uracil (uracil is found in RNA and pairs with adenine there). So the correct pairing in DNA is adenine with thymine. The other options don’t fit because adenine does not pair with cytosine, guanine does not pair with uracil in DNA, and cytosine does not pair with thymine.

DNA base pairing is highly specific: adenine forms two hydrogen bonds with thymine, and guanine forms three hydrogen bonds with cytosine. This complementary pairing underpins the double-helix structure and accurate DNA replication, with A pairing with T and G pairing with C. In DNA, thymine is used rather than uracil (uracil is found in RNA and pairs with adenine there). So the correct pairing in DNA is adenine with thymine. The other options don’t fit because adenine does not pair with cytosine, guanine does not pair with uracil in DNA, and cytosine does not pair with thymine.

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