This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
Which enzyme is not present in muscles? 
Select and explain. 
A. Phosphorylase b, B. Hexokinase, C. Glucose-6-phosphatase, D. Glycogen synthase
C: Glucose-6-phosphatase
Answer: C: Glucose-6-phosphatase 
Explanation: Ans. C. Glucose-6-phosphataseMuscle Glycogen function is for muscle contraction. So, when muscle glycogenolysis ends, it ends with glucose-6- phosphate. So that this glucose 6 - Phosphates can directly enter into glycolysis for giving energy for muscle contraction. So therefore, glucose - 6 - phosphatase enzyme is absent in muscles. So that glucose - 6 - Phosphates is the end product of muscle glycogenolysis.