The reaction below is an exampie ol an) reaction. H-C-OH H--OH H-C-OPo, H-C-Oro Hydrolysis Oxidation-reduction Isomerization Bond formation using energy of ATP Group transfer a. b. с. d. e.
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- Which statement is FALSE? a. For S P, a catalyst shifts the reaction equilibrium to the right. b. After a reaction, the enzyme involved becomes available to catalyze the reaction again. c. A reaction may not occur at a detectable rate even though it has a favorable equilibrium. d. Substrate binds to an enzyme's active site. e. Lowering the temperature of a reaction will lower the reaction rate.Which of the following statement is FALSE? a.Catabolic pathways are energetically favorable. b.All energetically unfavourable reactions have a positive delta G. c.Reactions with a positive delta G can occur through reaction coupling with an energetically favourable reaction such that the overall delta G is negative. d.Carbon monoxide is the most energetically favourable form of carbon under normal conditions.Some cool enzyme (CE) catalyzes the conversion of compound F to compound A. Which of the following must be true of CE? a) CE can facilitate conversion of compound A into compound F. b) CE binds more tightly to the substrate F than to the product A. c) CE decreases the energy of the transition state between compounds F and A. d) CE facilitates net conversion of F to A whenever F is present.
- The hydrolysis of ATP has a large negative ΔG'°; nevertheless it is stable in solution due to: a. entropy stabilization. b. ionization of the phosphates. c. resonance stabilization. d. the hydrolysis reaction being endergonic. e. the hydrolysis reaction having a large activation energy.Which statements are true and which are false? Modify each false statement so that it reads correctly. a. In a closed system, neither energy nor matter is exchanged with the surroundings. b. State functions are independent of the pathway. c. A process is isothermic if ΔH = 0. d. The sign and magnitude of ΔG give important information about the direction and rate of a reaction. e. At equilibrium, ΔG = ΔG°. f. For two reactions to be coupled, they must have a common intermediate.What is an example where molecules or aroma within a cell physically overcome some barrier to their reaction going forward thag is exergonic one? (hint: think about what a catalyst physically does during a reaction).
- Which one of the following statements is true of enzyme catalysts? a. Their catalytic activity is independent of pH. b. They are generally equally active on D and L isomers of a given substrate. c. They can increase the equilibrium constant for a given reaction by a thousand fold or more. d. They can increase the reaction rate for a given reaction by a thousand fold or more. e. To be effective, they must be present at the same concentration as their substrate.You are observing an enzyme driven reaction. To the reaction mixture you add a chemical X which inhibits the reaction. If you add more substrate, the reaction rate approaches the Vmax of the uninhibited reaction. Furthermore, the structure of X is similar to the natural substrate. What kind of inhibitor is X?Which of the followingdescribe superior properties of enzymes (biological catalysts) over traditional chemical catalysts? a. They are mostly and generally operative under mild temperature, pressure, and pH conditions b. They are regulated only by substrate concentration c. They do not effect the reaction equilibrium, but lower the reaction's activation energy d. They are recycled at the end of the reaction Choose all that apply
- Explain briefly the following: 1-Oxidation-Reduction Reaction. 2- The influence of temperature on enzyme action.“Enzyme increases the rate of a reaction by lowering the activation energy. In doing so, it also changes the equilibrium of that reaction.” Do you agree/disagree with this statement? And why?Which of the following best indicates a reason why Hisneeds to be a good proton donor (not acceptor) in the catalytic triad mechanism? So that it can create the alkoxide ion. So that it can create a hydroxyde ion. None of the other options is suitable because His's only role is to be a proton acceptor. So that the first product forms and leaves with the correct number of H's. So that it can stabilize the transition state.