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What are the purine bases of DNA?

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Quick Answer

Adenine and guanine are the two purine bases of deoxyribonucleic acid. In a nucleotide, the purine base is attached to a sugar, deoxyribose, and a phosphate group. Deoxyribonucleotides are joined through phosphodiester bonds to make the polynucleotide DNA.

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Full Answer

A purine is composed of two connected nitrogenous rings. Adenine has one amine functional group attached to the larger of the rings. Guanine has a double-bonded oxygen along with one amine functional group attached to its ring. In DNA, a purine can form base pairs with a pyramidine, the other nitrogenous base, through hydrogen bonds. Adenine hydrogen bonds to thymine, and guanine hydrogen bonds to cytosine.

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