Question

what base pairs with adenine?
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Explanation:

In DNA, adenine (A) pairs with thymine (T), and in RNA, adenine pairs with uracil (U). Since the question is likely about DNA base pairing (a common biology topic), the base that pairs with adenine is thymine.

Answer:

Thymine (or Uracil if considering RNA, but DNA - Thymine is more common for such a basic question)