base

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Related to nitrogenous base: nucleic acid, DNA, amino acid, DNA structure
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Classical bioisosterism can exists among pyrimidine nitrogenous bases (single ring structure) like cytosine and uracil.
the features that describe the nitrogenous bases as categorical effects (complimentary pairs as the base pairs, similar pairs as pyrimidines and purines, chiral pairs as the right and left twist of the helix, polar pairs as the bonding arrangements), and
Unlike DNA, which is double stranded and consists of the four nitrogenous bases A, T, G and C, RNA is single stranded and has the nitrogenous base uracil ("U") instead of thymine ("T").