Uracil

Uracil is a pyrimidine base found almost exclusively in RNA. In nucleosides and nucleotides, uracil is linked to the sugar moiety via a covalent bond between nitrogen 1 in uracil and carbon 1 of the sugar.

The ribonucleoside containing uracil is called uridine. The deoxyribonucleoside containing uracil is called deoxyuridine.

See also: Figure 4.3, Figure 4.2, , De Novo Pyrimidine Nucleotide Metabolism, Deoxyuridine Nucleotide Metabolism, Nucleotide Salvage Synthesis