This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Amino acid used in the synthesis of purines ? 
Select and explain. 
A. Glycine, B. Ornithine, C. Alanine, D. Threonine
A: Glycine
Answer: A: Glycine 
Explanation: Ans. is 'a' i.e.,Glycine Amino acids involved in purine synthesis - Glycine, aspaate, glutamine.Amino acids involved in pyrimidine synthesis - Glutamine, aspaic acid (aspaate).