This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology, Subject name: Biochemistry
[{'content': 'Rate limiting enzyme of purine nucleotide synthesis is : \nSelect and explain. \nA. Xanthine oxidase, B. HGP, C. ADA, D. PRPP glutamyl amido-transferase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Rate limiting enzyme of purine nucleotide synthesis is PRPP Glutamyl Amido-transferase(option d) Rate limiting enzyme of Purine Nucleotide Catabolism is Xanthine Oxidase (Option a) Hypoxanthine and Guanine Phospho Ribosyl Transferase (HGP) catalyzes the conversion of Guanine to GMP and Hypoxanthine to IMP in the presence of PRPP. (Option b) Adenosine deaminase (ADA) catalyzes the conversion of Adenosine to Inosine. (Option c)', 'role': 'assistant'}]