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Guanine and adenine are _______________

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Guanine and adenine are _______________

(a) purines

(b) pyrimidines

(c) nucleosides

(d) gangliosides

This question was posed to me during an online exam.

This intriguing question comes from Gene Chemical Nature topic in portion Nature of Genome of Cell Biology

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Correct choice is (a) purines

To explain I would say: Purines are nitrogenous bases consisting of two rings. Adenine and guanine are purines whereas thymine and cytosine are pyrimidines.

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