https://doi.org/10.1351/goldbook.09710
Purine or pyrimidine nitrogenous base occurring in deoxyribonucleic acid (DNA) or ribonucleic acid (RNA).
Example: Purine and pyrimidine bases of ribo- and deoxyribonucleotides.
Purine bases | Pyrimidine bases | ||
|---|---|---|---|
| Adenine (A) |  | Cytosine (C) |  |
| Guanine (G) |  | Thymine (T) b) |  |
| Uracil (U) a) |  | ||
| a) Uracil is normally found in RNA but not in DNA. b) Thymine is usually found in DNA but not in RNA. | |||