Question

Write down the structural of pyrimidine and purine bases

Answer 1

Pyrimidine Structure
Pyrimidine is a simple aromatic ring composed of two nitrogen atoms and four carbon atoms, with hydrogen atoms attached to each carbon. The carbon and nitrogen atoms are connected via alternating double and single bonds. This bond structure allows for resonance, or aromaticity, causing the ring to be very stable. There are many derivatives of this structure through the addition of one or more functional group. These derivatives all retain the simple six-membered ring, but the modifications can range from addition of a few atoms in nucleic acids to complex structures in drugs and vitamins.

Answer 2

The pyrimidine bases have a 6‐membered ring with two nitrogens and four carbons.




The purine bases have a 9‐membered double‐ring system with four nitrogens and five carbons.



Although both purine and pyrimidine rings have one 6‐membered component with two nitrogens and four carbons, the purines and pyrimidnes are not related metabolically. Distinct pathways for purine biosynthesis and degradation and for pyrimidine biosynthesis and degradation, exist in all organisms.