Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 4, Problem 9RQ
Summary Introduction
To review:
The principle involved in coupled reactions.
Introduction:
Coupled reactions are a pair of reactionsthat have the same or common intermediate products. One reaction’s product works as a reactant for the other reaction. The free energy changes that occur during the individual reactions are combined to find the free energy change for the (complete)coupling reaction.
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Which one of the following statements is completely TRUE?
O When AG > 0, the reaction is BOTH product-favored (spontaneous) AND endergonic.
When AG 0, the reaction is BOTH reactant-favored (nonspontaneous) AND endergonic.
When AG > 0, the reaction is BOTH product-favored (spontaneous) AND exergonic.
When AG > 0, the reaction is BOTH reactant-favored (nonspontaneous) AND exergonic.
When AG < 0, the reaction is BOTH reactant-favored (nonspontaneous) AND exergonic.
Which of the following statements are true for BOTH the "transition state" and an
"intermediate" of reaction? (This is a multi-select question, select all that apply.).
Both are only observed in enzyme-catalyzed reactions.
Both can be converted to product(s) or might decompose back to the reactant(s).
Neither are part of the "net equation" for the reaction.
Both contain covalent bonds are in the process of breaking and/or forming.
Both are part of every chemical reaction. (i.e. the mechanisms of all chemical
reactions, whether enzyme catalyzed or not, will have involve both a transition
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How does the rate of the forward reaction compare to the rate of the reverse reaction for an endergonic reaction? For an exergonic reaction? Explain.
Chapter 4 Solutions
Biochemistry: The Molecular Basis of Life
Ch. 4 - Prob. 1QCh. 4 - Prob. 2QCh. 4 - Prob. 1RQCh. 4 - Prob. 2RQCh. 4 - Prob. 3RQCh. 4 - Prob. 4RQCh. 4 - Prob. 5RQCh. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Prob. 8RQ
Ch. 4 - Prob. 9RQCh. 4 - Prob. 10RQCh. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Prob. 15RQCh. 4 - Prob. 16RQCh. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - Prob. 19RQCh. 4 - Prob. 20RQCh. 4 - Prob. 21RQCh. 4 - Prob. 22RQCh. 4 - Prob. 23RQCh. 4 - Prob. 24RQCh. 4 - Prob. 25RQCh. 4 - Prob. 26RQCh. 4 - Prob. 27RQCh. 4 - Prob. 28RQCh. 4 - Prob. 29RQCh. 4 - Prob. 30FBCh. 4 - Prob. 31FBCh. 4 - Prob. 32FBCh. 4 - Prob. 33FBCh. 4 - Prob. 34FBCh. 4 - Prob. 35FBCh. 4 - Prob. 36FBCh. 4 - Prob. 37FBCh. 4 - Prob. 38FBCh. 4 - Prob. 39FBCh. 4 - Prob. 40SACh. 4 - Prob. 41SACh. 4 - Prob. 42SACh. 4 - Prob. 43SACh. 4 - Prob. 44SACh. 4 - Prob. 45TQCh. 4 - Prob. 46TQCh. 4 - Prob. 47TQCh. 4 - Prob. 48TQCh. 4 - Prob. 49TQCh. 4 - Prob. 50TQCh. 4 - Prob. 51TQCh. 4 - Prob. 52TQCh. 4 - Prob. 53TQCh. 4 - Prob. 54TQCh. 4 - Prob. 55TQCh. 4 - Prob. 56TQCh. 4 - Prob. 57TQCh. 4 - Prob. 58TQCh. 4 - Prob. 59TQCh. 4 - Prob. 60TQCh. 4 - Prob. 61TQCh. 4 - Prob. 62TQ
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- What do the following indicators tell you about whether a reaction can proceed as written? (a) The standard free-energy change is positive. (b) The free-energy change is positive. (c) The reaction is exergonicarrow_forwardGive an example of each Irreversible and Reversible Reactions?arrow_forwardFor this reaction: 6CO2 + 6H2O → C6H12O6 + 6O2, the products have 2760 kJ/mole more free energy than the reactants. So, which of the following statements best describes the reaction? a The reaction is endergonic because it converts molecules with less free energy to those with more free energy. b The reaction is exergonic because it converts molecules with less free energy to those with more free energy. c The reaction is exergonic because it converts molecules with more free energy to those with less free energy d The reaction is endergonic because it converts molecules with more free energy to those with less free energy.arrow_forward
- if the reaction given below occurs and pure A and B were mixed, which of the following would take place as equilibrium was established A + B ⇌ C a. the concentration of C would increase for a time, then remain constant b. the concentration of A would increase for a time, then decrease c. the concentration of B would increase for a time, then remain constantarrow_forwardAn exergonic reaction has which of the following properties? A) The △G is negative and the reaction is spontaneous. B) The △G is negative and the reaction is non-spontaneous. C) The △G is positive and the reaction is spontaneous.arrow_forwardWhat is the net change in energy in the reaction shown (decrease, increase, or little change in energy) ? Is it spontaneous?arrow_forward
- Under what conditions might a reaction be endothermic but exergonic? Explain.arrow_forwardLabel the following statements true or false: (c) A nonspontaneous reaction will proceed spontaneously in the reverse direction. (d) A spontaneous process can occur with a large decrease in entropy.arrow_forwardWhat is the benefit of coupling exergonic and endergonic reactions?arrow_forward
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