Describe DNA and RNA bases, complementation pattern and bonds?

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Describe DNA and RNA bases, complementation pattern and bonds?




Adenine and guanine are purines with two interlocking rings based on nitrogen and carbon atoms (numbered 1 to 9. Cytosine and thymine are pyrimidines with a single ring. Adenine, cytosine, and guanine are found in both DNA and RNA, but the fourth base is thymine in DNA and uracil in RNA (they are closely related bases—carbon atom 5 in thymine has an attached methyl group, but in uracil the methyl group is replaced by a hydrogen atom).
In the A-T base pair, the adenine is connected to the thymine by two hydrogen bonds. In the G-C base pair, three hydrogen bonds link the guanine to the cytosine; a G-C base pair is therefore stronger than an A-T base pair. δ+ and δ- indicate fractional positive charges and fractional negative charges

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