| Purine | Pyrimidine |
|---|---|
| $(1)$ It consists of a double-ring structure. | $(1)$ It consists of a single-ring structure. |
| $(2)$ It contains $5$ carbon atoms in its heterocyclic ring system. | $(2)$ It contains $4$ carbon atoms in its heterocyclic ring system. |
| $(3)$ Examples include Adenine and Guanine. | $(3)$ Examples include Cytosine,Uracil,and Thymine. |
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