Question: Identify the purines and pyrimidines commonly found in nucleic acids.

Nitrogenous bases are biological substances containing nitrogen that combine to produce nucleosides, which are then parts of nucleotides.Nucleotides serve as the fundamental building blocks of nucleic acids.

Purines and pyrimidines are the two types of nitrogen bases. Purines are larger than the pyrimidines because they have a two-ring structure, while the pyrimidines have only one ring.

Pyrimidines, also known as meta-diazines, have a structure similar to benzene and pyridine. Thymine, cytosine, and uracil are pyrimidines. DNA normally contains thymines and cytosines, whereas RNA has uracil and cytosine.

Purines are heterocyclic systems made up of pyrimidine and an imidazole that has been condensed at the 4-5 bond. Adenine and guanine are the purines found in DNA and RNA. Guanine and adenine pair with cytosine and thymine, respectively.