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Other than the number of rings, what is similar and what is different about the groups...

Other than the number of rings, what is similar and what is different about the groups attached to the pyrimidine versus purine bases? Consider all five of them. What gets attached to UMP to form CMP? What about for IMP to GMP or AMP?

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Answer #1

The purines are Adenine (A), and Thymine (T). And the pyrimidines include Guanine (G), Urasil (U), and cytosine (C). The purines have double rings, which make them bigger than pyrimidines (only have a single ring). Other than the number of rings, the similarity between the purines and pyrimidines is the formation of the hydrogen bond. Both purines and pyrimidines form hydrogen bond with their corrosponding nitrogenous base.

The difference is their location or place of occurence. The purines are found in both DNA and RNA, while among the pyrimidines, only Guanine is found in both DNA and RNA. The cytosine is found only in DNA, while Urasil is found only in RNA.

The pyrimidines gets attached to UMP to form CMP, and purines gets attached to IMP to form GMP or AMP.

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