Which of the following are mechanisms that prevent the liver from using up glucose that is more urgently required by other tissues? (select all that apply) Group of answer choices Glucokinase (the liver's version of hexokinase) has a lower affinity for glucose than hexokinase does GLUT2 has a lower affinity for glucose than GLUT4 does The liver produces insulin when blood glucose levels are low The liver does not express a phosphofructokinase enzyme The liver increases glycolysis in response to glucagon

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