purines have two ring structures (adenine and guanine) while pyrimidines have one (thymine, cytosine and uracil). Adenine, guanine, thymine and cytosine are found in DNA whereas RNA replaces thymine with uracil.
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purines have two ring structures (adenine and guanine) while pyrimidines have one (thymine, cytosine and uracil). Adenine, guanine, thymine and cytosine are found in DNA whereas RNA replaces thymine with uracil.
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