5-phospho-alpha-D-ribose 1-diphosphate + uracil => UMP + diphosphate
5-phospho-alpha-d-ribose 1-diphosphate + uracil => ump + diphosphate
5-phospho-alpha-D-ribose 1-diphosphate + uracil => UMP + diphosphate
5-phospho-alpha-d-ribose 1-diphosphate + uracil => ump + diphosphate