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
Glycine is present in all except? 
Select and explain. 
A. Creatine, B. Purine, C. Glutamine, D. Glutathione
C: Glutamine
Answer: C: Glutamine 
Explanation: Ans. is 'c' i.e.,Glutamine GlycineIt is a nonessential amino acid which is synthesized from serineGlycine is necessary for the formation Heme, purine ring, bile acids conjugation (formation of glycocholic acid, and glyco-chenodeoxycholic acid), creatine, glutathione, glucose (by gluconeogenesis).