<prompt> Salvage purine synthesis refers toSynthesis of purine from ribose-5-phosphateSynthesis of purine from pyrimidineSynthesis of purine nucleotides from purine basesNone of the above  <response>: Nucleotides and nucleosides can be supplied to an organism by either a salvage reaction or by synthesis from smaller precursors. Salvage reactions conve free purine and pyrimidine bases into nucleotides. Additionally, free purines and pyrimidines can be degraded, the purines to the oxidized ring compound uric acid and the pyrimidines to smaller compounds b-amino acids, not the a-amino acids found in proteins. Finally, purines and pyrimidines can be synthesized from smaller precursors de novo synthesis. Thus three interacting pathways for nucleotides, nucleosides, and the free bases exist salvage, degradation, and biosynthesis. Ref-Sathyanarayana 4e p471 