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
All are involved in non toxic transpo of ammonia except 
Select and explain. 
A. Glutamine synthetase, B. Glutaminase, C. Alanine cycle, D. SGPT
B: Glutaminase
Answer: B: Glutaminase 
Explanation: The amino acid used primarily by muscle, for transpo of ammonia to liver is alanine. Most other tissues however use glutamine