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Purines form hydrogen bonds to pyrimidines. Adenine pairs up with Thymine (in DNA) and Uracil (in RNA) and Guanine pairs with Cytosine. A-T pairing has 2 hydrogen bonds and C-G pairing has 3 hydrogen bonds.
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ADENINE -(always pair with)- THYMINE

CYTOSINE -(always pair with)- GUANINE
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