Which groups can the nitrogen-containing bases that form rna, Biology

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

The nitrogen-containing bases that form RNA and DNA are classified as purine bases and pyrimidine.

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


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