This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
All of the following enzymes are active within a cell except 
Select and explain. 
A. Trypsin, B. Futnerase, C. Hexokinase, D. Alcohol dehydrogenase
C: Hexokinase
Answer: C: Hexokinase 
Explanation: Red Blood Cell Enzymopathies Hexokinase (HK), the red cell enzyme with the lowest activity in the glycolytic pathway, catalyzes the initial step in the utilization of glucose and thus is required for both glycolysis and the pentose shunt and produces glucose 6-phosphate. Ref Robbins 9/e pg 407