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In the structure of DNA, which nucleotide always pairs with adenine?

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Answer: Thymine, got it right on the test :)

User Kilgoretrout
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Thymine. The rules of base pairing or nucleotide pairing dictates that: adenine (purine) always pairs with thymine (pyrimidine) , cytosine (pyrimidine) always pairs with guanine (purine).

User Jeffrey Froman
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