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What are purines?
Adenine (A) and Guanine (G)
What are the pyrimidines?
Cytosine (C), Thymine (T), and Uracil (U)
Adenine
purine, base that pairs with Thymine in DNA, with and Uracil in RNA

Guanine
purine base that pairs with Cytosine in DNA and in RNA

Uracil
pyrimidine base that pairs with Adenine, found only in RNA (but not DNA because Thymine replaces Uracil as a base in DNA)

Thymine
pyrimidine base that pairs with Adenine, found only in DNA (Uracil replaces Thymine as a base in RNA)

Cytosine
pyrimidine base that pairs with Guanine in DNA and RNA
