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Purines and pyrimidines...

Purines and pyrimidines

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### Step-by-Step Solution: 1. **Definition of Purines and Pyrimidines**: - Purines and pyrimidines are types of nitrogenous bases that are essential components of nucleic acids (DNA and RNA). 2. **Identification of Purines**: - Purines consist of two nitrogenous bases: adenine (A) and guanine (G). - These bases are characterized by a double-ring structure. ...
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Assertion : The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason : Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.