DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

(1) Thymine: methylated pyrimidine-2,4-dione ()
(2) Guanine

Question

DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure.

(1) Thymine: methylated pyrimidine-2,4-dione ()
(2) Guanine: shown with incorrect ring fusion ()
(3) Cytosine: 4-aminopyrimidin-2(1H)-one
(4) Adenine: 6-aminopurine

Canvas Classes · Accepted Answer

DNA bases and their correct structures:

The four bases in DNA are: Adenine (A), Guanine (G), Cytosine (C), Thymine (T).

Correct structures:

| Base | Type | Key features |
|---|---|---|
| Thymine | Pyrimidine | C=O at C2 and C4, –CH₃ at C5 |
| Guanine | Purine | Bicyclic (pyrimidine + imidazole fused), –NH₂ at C2, C=O at C6, –NH at N1 |
| Cytosine | Pyrimidine | –NH₂ at C4, C=O at C2 |
| Adenine | Purine | Bicyclic, –NH₂ at C6 |

Guanine correct formula:

The SMILES shown for guanine in the q

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