Which of the following is/are pyrimidine(s)?

Adenine

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Cytosine

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Thymine

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Uracil

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Solution

The correct options are
B Cytosine
C Thymine
D Uracil
Nitrogenous bases in nucleic acids are of two types - purines and pyrimidines - based on their ring structure. Adenine and guanine constitute purines which have a double ringed structure. Pyrimidines consist of single ringed structure and examples are cytosine, uracil and thymine.

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