Why only deoxyribose of purine nucleotides reacts with dpa, but not pyrimidine?
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Purines (adenine and guanine) have two carbon nitrogen ring bases. ... I think purines bond with pyrimidines in the DNA ladder because adenine molecules only pair thymine molecules and guanine molecules only pair with cytosine molecules. A and T bond with 2 hydrogen bonds, C and G bond with 3 hydrogen bonds
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