Sections/problems listed with an asterisk (*) do not discuss the exact reaction indicated, but do discuss a closely related reaction. PRPP synthetase (EC 2.7.6.1) Section 10.2C ; P10.3 Uridine Carbamoyl phosphate synthase (EC 6.3.5.5) Section 12.2 * Aspartate carbamoyltransferase (EC 2.1.3.2) Section 12.2 * Dihydroorotase (EC 2.5.2.3) C12.4 Dihydroorotate dehydrogenase (EC 1.3.3.1) P16.5 Orotate phosphoribosyltransferase (EC 2.4.2.10) Section 10.2C Orotidine monophosphate decarboxylase (EC 4.1.1.23) C14.1 Thymine Thymidylate synthase (EC 2.1.1.45) C14.2 Cytosine CTP synthase (EC 6.3.4.2) P10.5a , P12.13 Inosine Glutamine phosphoribosyl amidotransferase ( EC 2.4.2.14 ) Section 11.5 Glycinamide ribonucleotide synthetase( EC 6.3.4.13 ) Section 12.2C GAR transformylase (EC 2.1.2.2) P12.14 FGAM synthetase ( EC 6.3.5.3 ) P12.16 Aminoimidazole ribonucleotide synthetase ( EC 6.3.3.1 ) P10.5b , P12.10 Aminoimidazole ribonucleotide carboxylase ( EC 4.2.1.1 ) Section 13.5 * SAICAR synthetase ( EC 6.3.2.6 ) Section 12.2C *; P12.17 , C14.4 Adenylosuccinate lyase ( EC 4.3.2.2 ) Section 14.1*; P14.9 AICAR transformylase ( EC 2.1.2.3 ) P12.15 IMP cyclohydrolase ( EC 3.5.4.10 ) P11.3 Adenosine Adenylosuccinate synthetase ( EC 6.3.4.4 ) P12.17 Adenylosuccinate lyase ( EC 4.3.2.2 ) Section 14.1*; P14.9 Guanosine IMP dehydrogenase (EC 1.1.1.205) Section 14.2B , Section 16.6B ; P16.6 GMP synthetase (EC 6.3.5.2) P10.5a, P12.13 Deoxynucleotides Ribonucleotide reductase (EC 1.17.4.1) Section 17.3B Organic Chemistry With a Biological Emphasis by Tim Soderberg (University of Minnesota, Morris)