Which one of the following is correct structure for cytosine?

Question

Canvas Classes · Accepted Answer

Structure of cytosine:

Cytosine is a pyrimidine base found in both DNA and RNA.

Correct structure of cytosine:
- Pyrimidine ring (6-membered with 2 N atoms)
- –NH₂ (amino group) at C4
- C=O (carbonyl) at C2
- Double bond between C5 and C6

Molecular formula:

Distinguishing from other bases:
| Base | Key features |
|---|---|
| Cytosine | –NH₂ at C4, C=O at C2 |
| Uracil | C=O at C2 and C4 (no –NH₂) |
| Thymine | C=O at C2 and C4, –CH₃ at C5 |

The SMILES  correctly represents cytosine with –N

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