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Question

Which one of the following pair is a purine pair?

A
Adenine, Guanine
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B
Uracil, Guanine
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C
Adenine, Thymine
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D
Cytosine, Thymine
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Solution

The correct option is A Adenine, Guanine
DNA (deoxyribose nucleic acid) consists of 3 different molecules - phosphate, 5-carbon deoxyribose sugar and nitrogenous base. The nitrogenous base may be a 9-membered, double purine, i.e., adenine (A) or guanine (G), or a 6-membered, single -ringed pyrimidine, i.e., thymine (T) or cytosine (C).

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