<prompt> Glycine provides all in purine synthesis, except ?Carbon - 4Carbon - 5Nitrogen - 4Nitrogen - 7  <response>: Ans. is c i.e., Nitrogen - 4 In de novo synthesis, purine ring is formed from variety of precursors is assembled on ribose-5-phosphate. Precursors for de novo synthesis are ?Glycine provides C4, Cs and N7Aspaate provides NIGlutamine provides N3 and N9Tetrahydrofolate derivatives furnish C2 and CsCarbon dioxide provides C6 