Pyrimidine bases present in DNA are cytosine and thymine.
What is Nucleotide?
A nucleotide is an organic molecule with a basic composition of a nitrogenous base, pentose sugar and phosphate. DNA and RNA are polynucleotides, which contain a chain of nucleotides monomers with different nitrogenous bases. A nucleotide consists of three units, which are covalently linked. They are:
- Nitrogenous bases – Purine and Pyrimidine
- Pentose Sugar – Ribose and Deoxyribose
- Phosphate – monophosphate, diphosphate, triphosphate
Nitrogenous bases contain purine or pyrimidine base. DNA contains adenine (A), guanine (G), thymine (T) and cytosine (C), whereas RNA contains adenine, guanine, uracil (U) and cytosine.