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Which of the following best describes cytosine?

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in Chemistry – Class 12 by (188k points)
Which of the following best describes cytosine?

(a) pyrimidine, present in RNA and DNA

(b) pyrimidine, present only in DNA

(c) purine, present only in RNA

(d) purine, present in RNA and DNA

I had been asked this question in unit test.

Question is taken from Biomolecules in section Biomolecules of Chemistry – Class 12

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Correct answer is (a) pyrimidine, present in RNA and DNA

Explanation: Bases (nitrogen containing heterocyclic compounds) are of two types. Those that have a single ring are purines, and those that have two fused rings are pyrimidines. Adenine, guanine and cytosine are present in both RNA and DNA.

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