7. Which of the following statements is true about enzyme-catalyzed reactions?The reaction is faster than the same reaction in the absence of the enzymeb. The free energy change of the reaction is opposite from the reaction withoutthe enzymeThe reaction always goes in the direction toward chemical equilibriumd. Enzyme-catalyzed reactions require energy to activate the enzymee. Enzyme-catalyzed reactions release more free energy than noncatalyzedreactionsThe following questions are based on the reaction A+B C+DFree Energy-A+BProgress of the ReactionC.D

The reaction which occurs in the presence of an enzyme is called enzyme catalysed reaction.Enzymes…

Answered: 7. Which of the following statements is…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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8. Which of the following is characteristic of a competitive inhibitor of an enzyme-catalyzed reaction? A. The inhibitor binds covalently to the enzyme. B. The inhibitor increases the substrate binding affinity to the enzyme. C. In the presence of the inhibitor, the reaction exhibits an apparent increase in Km. D. In the presence of the inhibitor, the reaction exhibits an apparent decrease in Vmax- E. Increasing the substrate concentration fails to overcome the effects of the inhibitor.
The first question 7
1. Compare and contrast the activation free energy and the free energy change for an enzyme-catalyzed reaction.
47. The transfer of Energy and subsequent production of ATP (cellular respiration) is actually a(n). the breakdown of Glucose, which is energetically, rxn. However, the reaction requires Bles Yourn a. endergonic : exergonic b. exergonic : endergonic c. catabolic : neutral d. dehydration : unstable
22. What is a major benefit of calculating catalytic efficiencies? Group of answer choices It determines whether a catalytic reaction is cooperative It allows you to compare different substrate preferences for an enzyme It tells you the rate of an enzyme reaction It allows you to determine the efficiency of the enzyme being studied
2. Draw a graph showing a downhill (spontaneous) reaction, that requires some activation energy to get it going. Then draw and clearly label on the graph b. The activation energy for the reaction (use a bracket to indicate the upper and lower limits) c. The free energy change for the reactions (use a bracket to indicate the upper and lower limits) d. How an enzyme will change the energetics of the reaction. I suggest you use a dotted line for the enzyme.
45. Which of the following is/are true? (MARK ALL THAT APPLY) Group of answer choices Enzymes lower the activation energy of the reaction Enzymes bind more strongly to the substrates than the transition state of the reaction Enzymes alter the standard free energy of the reaction. Enzymes force reactions to proceed in only one direction. Enzymes alter the equilibrium of the reaction. PreviousNext
11. Refer to the figure below. нн Н `NH2 NH2 N' N- 2e-+H* R NAD+ NADH NAD+ functions as a coenzyme in many enzyme-catalyzed reactions. The changes that take place in this coenzyme are the same for all of these reactions and are illustrated in the figure. It is likely that, in these reactions, NAD+ functions as an electron acceptor (reducing agent) in redox reactions. functions as an electron donor (oxidizing agent) in redox reactions. functions as a base in acid-base catalytic mechanisms. functions as an electron donor (oxidizing agent) in redox reactions. functions as an electron acceptor (oxidizing agent) in redox reactions. +Z-
1. define in your own words enzyme 2. explain how enzymes act on a substrate 3. explain the term catalyst 4. what is meant by optimal conditions for enzymes and what are the conditions 5. explain what catalase is: what it helps to break down and into what parts.
37. Consider the following energy diagram for an enzyme-catalyzed reaction. D B A C E G Which step is probably the slowest? a. A →B →C b. C D E c. E F G d. G H I
3. The reaction shown below is catalyzed along the pathway of glycolysis by an enzyme with the active site architecture shown. A. The enzyme has two Mg2+ ions, a lysine general base (deprotonated) and a glutamate general acid. In the box below, draw a plausible mechanism for this reaction, which has two formal steps with one intermediate between them (hint: one step uses the general acid and the other uses the general base.) O +(87 -00 11 R-00 00 00 + H₂O OH O Mg2+ Mg2+ Lys (general base) NH₂ OH Glu (general acid) enzyme active site
Consider the following free energy diagram for an uncatalyzed and enzyme-catalyzed reaction. Select all the statements that are true. Without enzyme With enzyme A+B Time AB Oa. The reaction is now spontaneous due to the addition of enzyme b. The rate of the enzyme catalyzed reaction is faster than the uncatalyzed reaction O C. The reaction is exergonic O d. The change in free energy for the reaction is greater in the catalyzed reaction, compared to the uncatalyzed reaction e. The enzyme stabilizes the transition state for the reaction Released Energy pes

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