MemotivaAP Biology Unit 1 Topic 1.6: Nucleic Acids — DNA, RNA, Nucleotide Structure and the Double Helix

What are purines and pyrimidines?

AP Biology Unit 1 Topic 1.6: Nucleic Acids — DNA, RNA, Nucleotide Structure and the Double Helix

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What are purines and pyrimidines?

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Purines and pyrimidines are the two structural classes of nitrogenous bases. Purines have a double ring structure and include adenine and guanine. Pyrimidines have a single ring structure and include cytosine, thymine, and uracil. A purine always pairs with a pyrimidine in double-stranded nucleic acids.
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