Final answer:
Hexokinase is the enzyme that commits glucose to glycolysis by converting it into glucose-6-phosphate.
Step-by-step explanation:
The enzyme that commits glucose to glycolysis is hexokinase (or glucokinase in the liver). Hexokinase converts glucose into glucose-6-phosphate by adding a phosphate to it. This conversion step traps glucose in the cell and allows glycolysis to proceed. Hexokinase has a higher affinity for glucose than glucokinase, making it more efficient in converting glucose.