The positions of nitrogen in purines are

1, 3, 5, 7

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1, 5, 7, 9

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1, 3, 6, 7

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1, 3 7, 9

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Solution

The correct option is D 1, 3 7, 9
Purine is a heterocyclic aromatic nitrogenous base. It has nitrogen (N) present in the positions 1,3,7, and 9.

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