This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Glutamate dehydrogenase in mitochondria is activated by: 
Select and explain. 
A. ATP, B. GTP, C. NADH, D. ADP
D: ADP
Answer: D: ADP 
Explanation: Ans. D. ADPGlutamate Dehydrogenase (GDH)Liver Glutamate Dehydrogenase (GDH) is allosterically inhibited by ATP, GTP, NADH.Liver Glutamate Dehydrogenase (GDH) is allosterically activated by ADPReversible reaction but strongly favour Glutamate formationCan use either NAD+ or NADP+.