Common substrate for purine and pyrimidine synthesis are all except ?: (A) Glutamine, (B) Glycine, (C) Aspaate, (D) Carbon dioxide
Answer is B. Ans. is b i.e., Glycine Glutamine, aspaate (aspaic acid) and CO, are preursors for both purines & pyrimidines.In de novo synthesis, purine ring is formed from variety of precursors is assembled on ribose-5-phosphate.