Can a purine pair with a purine?

A always pairs with T and C always pairs with G. A and G are purines, meaning that they have two rings, while T and C are pyrimidines, meaning they have one ring.  Due to the Watson and Crick model, the width of DNA is constant, meaning that there must be a consistant width in each base pairing.  As a result, only a purine can pair with a pyrimidine, giving each base pairing a total of 3 rings.

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linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.