This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Which of the following is not involved in synthesis of pyrimidines? \nSelect and explain. \nA. Glutamine, B. CO2, C. Aspaic acid, D. Glycine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The pyrimidine synthesis is a similar process than that of Purines(Purines Synthesis). In the de novo synthesis of Pyrimidines, the ring issynthesized first and then it is attached to a ribose-phosphate to for a pyrimidinenucleotide. Pyrimidine rings are assembled from bicarbonate, aspaate, and Ammoni', 'role': 'assistant'}]