This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
Glycine can be synthesised from all except 
Select and explain. 
A. Aspaate, B. Alanine, C. Glycoxylate, D. Glutamate
A: Aspaate
Answer: A: Aspaate 
Explanation: Glycine can be formed from Serine which can be reversibly formed from Alanine.Glycine aminotransferase can catalyze the synthesis of glycine from glyoxylate and glutamate or alanine. This reaction strongly ours synthesis of glycineRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 210