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What are the purine bases and pyrimidine bases?

Answer:
They are the nitrogen bases that are attached to RNA and DNA. In DNA, adenine and guanine are purines and thymine and cytosine are pyrimidines. In RNA, thymine is replaced by pyrimidine uracil.
First answer by Stevekim012. Last edit by Stevekim012. Contributor trust: 263 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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