The liver provides glucose to the rest of the body between meals. It does so by breaking down glycogen ,forming glucose 6-phosphate in the penultimate step. Glucose 6-phosphate is converted to glucose by splitting of the phosphate. Why do you suppose the liver removes the phosphate by hydrolysis, rather than reversing the reaction by which glucose 6-phosphate is formed from glucose? By reversing this reaction , the liver could generate both glucose and ATP