Purines are nitrogenous bases with ring(s) in their structure while pyrimidines have ring(s) in their structure.

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Solution

The correct options are
A one
B two
DNA is a macromolecule made up of nucleotides. Each nucleotide consists of a sugar and a nitrogenous base. Bases are of two types - purines and pyrimidines. Purines have a double ringed aromatic structure. Adenine and guanine are examples of purines. Pyrimidines have a single ringed structure. Cytosine, thymine and uracil are examples of pyrimidine.

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