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Adenine is one of the four nitrogenous bases found in DNA and RNA molecules. In DNA, it pairs with thymine (T), while in RNA it pairs with uracil (U).
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The nitrogenous base that pairs with adenine in DNA.
The nitrogenous base that replaces thymine in RNA and pairs with adenine.
Base Pairing Rule: The rule stating that cytosine pairs with guanine and adenine pairs with thymine or uracil depending on whether the molecule is DNA or RNA.