Nitrogenous bases such as uracil (2, 4-dioxy pyrimidine), thymine (2, 4-dioxy-5-methyl pyrimidine) and cytosine (2-oxy-4-amino pyrimidine) are pyrimidines. Cytosine and thymine are found in the DNA but in the RNA, thymine is replaced by uracil.
The pyrimidine undergoes catabolism through ring cleavage. The end products of catabolism are beta-amino acids, ammonia and carbon dioxide.
