Reply to comment
Purines & Pyrimidines
Purine = Pyrimidine + Imidazole ring
Purines are double ring structures and has pyrimidine ring in it fused to an imidazole ring.
Think: "Pyrimidines can be CUT out from purines!"
Thus, Pyrimidines are
- Cytosine
- Uracil
- Thiamine
Purines include Adenine, Guanine, Xanthine & Hypoxanthine.

This work is licensed under a Creative Commons Attribution-Share Alike 3.0 license.