Table 2.
Chemical structures and properties of the four nucleotide types
| Chemical structure and property | Class | Nucleotides |
|---|---|---|
| Ring structure | Purine | A, G |
| Pyrimidine | C, U | |
| Functional group | Amino | A, C |
| Keto | G, U | |
| Hydrogen bond | Strong | C, G |
| Weak | A, U |
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