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Bases:
The bases in DNA have carbon-nitrogen ring structures; because of the nitrogen atoms they are called nitrogenous bases. There are two types of ring structure. Adenine and guanine are purines, every having two joined carbon-nitrogen rings but with different side-chains. Thymine and cytosine are pyrimidines in the figure each has only one carbon-nitrogen ring and again they differ in their side-chains.
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