<prompt> Inosine is biological precursor of:Orotic acid and Uridylic acidUracil and ThymineAdenylic acid, Guanylic acidPurines and Thymine  <response>: IMP Inosine Mono Phosphate the first purine nucleotide to be formed. It is the parent nucleotide which synthesize AMP GMP and then diphosphate and triphosphate forms can be synthesized. 