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Two groups which can nitrogen-containing bases

Write down the two groups which can nitrogen-containing bases which form DNA and RNA be categorized? What is the criterion employed in that categorization?

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The nitrogen-containing bases which form DNA and RNA are categorized as pyrimidine and purine bases. By analysis of structural formulae of those nitrogen-containing bases it is probable to realize that three of them, uracil, thymine and cytosine, encompass only one nitrogenized carbon ring. The others, adenine as well as guanine, encompass two nitrogenized allocated carbon rings.

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