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purines are double ringed nitrogenous bases of DNA and RNA including adenine and guanine. the three others are cytosine and thymine( uracil is present instead of thymine in RNA) are pyrimidines.

1.nitrogen is present at 1,3,7,9 positionin in purines.

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What nucleotide is a double ringed molecule?

Purines are nucleotides with a double ringed structure.Adenosine and Guanine are purines


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