Two substrates (A and B) are used to produce a certain biological product in an enzyme- catalyzed reaction. It is found that both substrates must bind to the enzyme, first Substrate A, then Substrate B before the product is produced. What kind of kinetic mechanism is described? Linear Reaction Ordered Sequential Reaction Random Sequential Reaction Ping Pong Reaction
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- Which of the following is TRUE concerning the induced fit model of enzyme catalysis? * (One correct answer only) A. The active site can be influenced by molecules binding elsewhere on an enzyme B. The initial binding of enzyme and substrate is the most tightly bound conformation C. The induced fit must occur prior to the initial binding of enzyme and substrate in order for the reaction to proceed D. The binding of enzyme and substrate is weakest in the transition stateSubstrates and reactive groups in an enzyme’s active site must be precisely aligned in order for a productive reaction to occur. Why, then, is some conformational flexibility also a requirement for catalysis?What are enzymes? What distinguishes enzymes from regular chemical catalysts? On the specificity of enzyme action, please comment. Which factor accounts for their specificity the most? Describe the enzyme catalysis mechanism.
- Which of the following statements regarding enzymes and transition states is true? stabilization of the transition state must be less than stabilization of ES for catalysis to occur binding of substrate to an enzyme often causes strain, thus promoting transition state formation the transition state conformation of an enzyme catalyzed reaction is identical to the conformation seen in the uncatalyzed transition state formation of the transition state always assures that the reaction will proceed to product none of the above are trueSome enzymes have catalytic activity only limited by diffusion. Which rate constants of an enzyme- catalyzed reaction is/are rate limiting for the enzyme? How does this line up/compare to the rate limiting step of Michaelis-Menten Enzyme Kinetics? (Please show work and correct answer)Which of the following is not a mechanism that enzymes use to lower the activation energy of a reaction?
- When the final product of a series of enzymatically-catalyzed reactions binds to the first enzyme in the pathway to limit its production, it generally uses ___ because the structure of this final product is generally not similar to that of any of the enzyme's normal substrates. Zymogen activation Covalent modification Competitive inhibition Allosteric activation Allosteric inhibitionWhich of the following is not an assumption made when evaluating Michaelis Menton kinetics? the reaction is happening at body temperature the substrate is in great excess of the catalyst measurement of initial velocity of the reaction reaction conditions are occurring under steady stateAn enzymes catalyzed reaction is studied in the presence and absence of an inhibitor. The following data was obtained in the image provided. Plot 1/[S] as abscissa and 1/V as ordinate for both catalyzed reactions and reaction with inhibitor. Use the same graph for both plots Calculate the following: Km of enzyme in the reaction without inhibitor Km' of the enzyme in the reation with inhibitor Vmax of the uninhibited reaction Vmax of the inhibited reaction What kind of inhibitor was added to the enzyme catalyzed reaction? Explain your answer in terms of changes in Km and Vmax.
- An inactive form of an enzyme becomes active after being phosphorylated. When glucose is converted to glucose-6-phosphate by hexokinase, the accumulation of glucose-6-phosphate inhibits the reaction. A foreign substance is added to the reaction above. This substance binds to hexokinase and prevents its ability to catalyze the reaction.Reaction 25.2 Glucose (aq) + PO43- (aq) ⇄ Glucose-PO43- (aq) Reaction 25.2 is nonspontaneous and very slow. Use this information to sketch a reaction diagram for Reaction 25.2. Clearly label the x axis, y axis, products, reactants, and activation energy.Why can’t enzyme kinetics prove that a particular enzyme mechanism is correct?