1. The following glycolytic enzyme is regulated by phosphorylationpyruvate kinaseglyceraldehyde 3-phosphate dehydrogenasehexokinaseadolase2. Which of the following enzymes catalyzes the first committed step of glycolysisphosphofructokinase Ihexokinasephosphoglucomutaseglucose-6-phosphate isomerase3. Which of the following strategies are used by cells in the coordinated regulation of carbohydrate metabolism?All of the above strategies function in cells to regulate carbohydrate metabolismA change in the expression of metabolic enzymesAn allosteric change in the activity of metabolic enzymesA change in the cellular location of existing metabolic enzymesPhosphorylation or dephosphorylation of an enzyme in a metabolic pathway4. Choose a False statementDifferent enzymes in the same tissue always have similar half-livesWithin a metabolic pathway most reactions operate near equilibrium. Key enzymes operate far from equilibriumIsozymes are different enzymes that catalyze the same reactionATP and AMP are key cellular regulatorsnone of the answers are correct5. Choose a False statement regarding general principles of homeostasis. Steady state is equivalent to equilibriumOrganisms maintain homeostasis by keeping the concentrations of most metabolites at steady stateIn steady state, the rate of synthesis of a metabolite equals the rate of breakdown of this metabolite. Pathways are at steady state unless perturbedAfter perturbation a NEW steady state will be establishednone of the answers are correct