Answer :

Final answer:

Adenine is a purine base in DNA and pairs with thymine due to complementary base pairing.


Explanation:

Adenine is a purine base in DNA. Purines and pyrimidines are the two types of nitrogenous bases found in DNA, with adenine and guanine classified as purines. In DNA, adenine always pairs with thymine due to complementary base pairing.


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