What is a pyrimidine in biology?

Answer:
It is a molecule that is used as an information containing 'Base' that is found in both the Rna and DNA chains.

It is found there along with other Bases: 3 are pyrimidines - Cytosine and Thymine in DNA, Uracil replaces Thymine in Rna; and 2 are purines - Adenine and Guanine [in both].
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