Explain the bases, Biology

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The bases in DNA have carbon-nitrogen ring structures; due to the nitrogen atoms they are known as nitrogenous bases. There are two parts of ring structure. Adenine and guanine are purines, each having two joined carbon-nitrogen rings but with dissimilar side-chains.  Thymine and cytosine are pyrimidines in the figure evary has only one carbon-nitrogen ring and again they vary in their side-chains.

 


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