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Categorization of RNA and DNA

Into which two classes can the nitrogen having bases which form RNA and DNA be categorized? What is the criterion employed in that categorization?

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The nitrogen having bases which form RNA and DNA are categorized as purine and pyrimidine bases. By the analysis of structural formulae of such nitrogen bases it is probable to realize that three of them, thymine, cytosine, and uracil, contain only one nitrogenized carbon ring. The others, guanine and adenine, contain two nitrogenized related carbon rings.

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