Which base of DNA is a pyrimidine that pairs with adenine?

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Multiple Choice

Which base of DNA is a pyrimidine that pairs with adenine?

Explanation:
DNA base pairing relies on a purine pairing with a pyrimidine to keep the double helix width constant. Adenine is a purine, so its partner must be a pyrimidine. Thymine is a pyrimidine, and it pairs with adenine via two hydrogen bonds. This A–T pairing is a key part of how the DNA ladder stays uniform, alongside the G–C pairing (guanine with cytosine). In RNA, thymine is replaced by uracil, but in DNA the partner for adenine is thymine.

DNA base pairing relies on a purine pairing with a pyrimidine to keep the double helix width constant. Adenine is a purine, so its partner must be a pyrimidine. Thymine is a pyrimidine, and it pairs with adenine via two hydrogen bonds. This A–T pairing is a key part of how the DNA ladder stays uniform, alongside the G–C pairing (guanine with cytosine). In RNA, thymine is replaced by uracil, but in DNA the partner for adenine is thymine.

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