Glycine can be synthesized from all, EXCEPT:: (A) Choline, (B) Serine, (C) Alanine, (D) None of the above
Answer is D. Glycine aminotransferases can catalyze the synthesis of glycine from glyoxylate and glutamate or alanine. Unlike most aminotransferase reactions, these strongly or glycine synthesis. Additional impoant mammalian routes for glycine formation are from choline and from serine Ref: Harper 28th edition, chapter 27.