purine vs pyrimidine

Question

Purine bases in DNA are:

RankGuru · Accepted Answer

1. **Structural Types**: Nitrogenous bases are classified based on their heterocyclic ring systems.
2. **Purines**: Have a double-ring structure (a six-membered ring fused to a five-membered ring). These are **Adenine (A)** and **Guanine (G)**.
3. **Pyrimidines**: Have a single six-membered ring. These are **Cytosine (C)**, **Thymine (T)**, and **Uracil (U)**.
4. **DNA Bases**: A, G, C, T. (Uracil is in RNA).
5. **Base Pairing**: A purine always pairs with a pyrimidine (A-T and G-C).

Rank Guru

purine vs pyrimidine

Select the correct option: