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Question

Purines have nitrogen atoms at ______ positions.

A
1',3',7',9'
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B
1',5',7',9'
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C
1',3'
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D
1',9'
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Solution

The correct option is A 1',3',7',9'
The purine bases have a 9‐membered double‐ring system with four nitrogens and five carbons. The two-carbon nitrogen ring bases (adenine and guanine) are examples of purines.
So, the correct option is '1',3',7',9'.

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