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Biology 11 Online
OpenStudy (anonymous):

4. Into which two groups can the nitrogen-containing bases that form DNA and RNA be classified? What is the criterion used in that classification?

OpenStudy (alphadxg):

By the analysis of the structural formulae of those nitrogen-containing bases it is possible to realize that three of them, cytosine, thymine and uracil, have only one nitrogenized carbon ring. The others, adenine and guanine, have two nitrogenized associated carbon rings.

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