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Nitrogenous bases are organic compounds that owe their basic properties to the lone pair of electrons of a nitrogen atom. Typical nitrogenous bases are ammonia (NH3), triethylamine, pyridine, and the nucleobases adenine, guanine, thymine, and cytosine. Nitrogenous bases can be classified under two groups: purines (A and G) and pyrimidines (C and T). These bases make up a crucial part of both deoxyribonucleotides and ribonucleotides, and the interactions between Adenine/Thymine and Guanine/Cytosine are the basis for the universal genetic code. Uracil replaces Thymine in RNA.For the structure and list of purines see this link: http://upload.wikimedia.org/wikipedia/en/5/5d/Purines.png
For the structure and list of pyrimidines see this link: Chemical structure of thymine Chemical structure of uracil Chemical structure of cytosine
Thymine Uracil Cytosine
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