what is the first step in an enzyme-catalyzed reaction? a. formation of enzyme-substrate complex b. ionization of enzyme c. dimerizing the substance d. catalysis of enzyme
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what is the first step in an enzyme-catalyzed reaction?
a. formation of enzyme-substrate complex
b. ionization of enzyme
c. dimerizing the substance
d. catalysis of enzyme
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- the type of enzyme inhibition in which covalent bulky adduct prevents catalysis is ? a) uncompetitive b) reversible c) noncompetitive d) competitive e) IrreversibleChoose the best answer The active site of an enzyme is the place where the following happens: a)The enzyme-substrate complex forms and the reaction occurs at the active site. b)The enzyme substrate complex forms here. c)The catalytic reaction happens here. d)Allosteric regulation of enzyme rate occurs here. e)All of these are correct.Which of the following accurately describes how an enzyme functions? a. reduces the energy content of the products b. allows for the exothermic reaction of materials that are usually endothermic c. changes the reaction mechanism effectively reducing the activation energy d. shifts the equilibrium for the reaction
- How does an enzyme affect a chemical reaction? Select all that apply. A. Lowers the activation energy B. Decreases the rate of the reaction C. Increases the activation energy D. Increases the rate of the reactionBased on the given question which of the following choices is the correct answer?A. When an enzyme catalyzes a reaction, it increases the activation energy of the reactionB. When an enzyme catalyzes a reaction, it decreases the activation energy of the reactionC. When an enzyme catalyzes a reaction, it increases the activation energy of the productD. When an enzyme catalyzes a reaction, it does not affect the activation energy of the reaction.Which of the following statements is/are true about enzyme-catalyzed reactions? A. The reaction is faster than the same reaction. B. The free energy change of the reaction is opposite from the reaction in the absence of the enzymes. C. The reaction always goes in the direction toward chemical equilibrium. D. A and B only E. A, B and C
- The active site _______________. a. is the compound that an enzyme reacts with during the chemical reaction.b. is where the reactants bind.c. is another term for “substrate.”d. is the term for an enzyme that has returned to its original state after achemical reaction.An allosteric site is the location on an enzyme’s surface wherea. the substrate binds.b. the signal molecule binds.c. catalysis takes place.d. ATP binds.Which statement best summarizes the structure of an enzyme before and after it catalyzes a reaction? a.) Its structure is the same. b.) It gains a water molecule in the reaction. c.) It loses a carbon atom in the reaction. d.) It loses a hydrogen atom in the reaction,
- If you wanted to improve the catalytic efficiency of an enzyme, what changes might you make to the enzyme and why? Consider what factors affect catalysis. You can suggest a change in the environment or a change in the protein itself.Choose the best description of an enzyme: (a) It allows a chemical reaction to proceed extremely fast. (b) It increases the rate at which a chemical reaction approaches equilibrium relative to its uncatalyzed rate. (c) It makes a reaction thermodynamically favorable.We can increase the rate of a reaction by decreasing the activation energy. And, we can do it by using an enzyme. Explain how enzyme decrease the activation energy.