Question: The precursor of all the pyrimidine nucleotides of the cell is: 
 Options:  <1> Uridine monophosphate (UMP). <2> Thymidine monophosphate (TMP). <3> Cytidine monophosphate (cmp). <4> Inosine monophosphate (IMP). <5> Guanidine monophosphate (GMP).
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