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
Muscle cannot take pa in gluconeogenesis due to absence of: 
Select and explain. 
A. Enolase, B. Glucose 6 phosphatase, C. Pyruvate kinase, D. All of the above
B: Glucose 6 phosphatase
Answer: B: Glucose 6 phosphatase 
Explanation: The conversion of glucose 6-phosphate to glucose is catalyzed by glucose 6-phosphatase. It is present in liver and kidney, but absent from muscle and adipose tissue, which, therefore, cannot expo glucose into the bloodstream. Ref: Harper 28th edition, chapter 20.