Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 5TYK
In the following graph:
A represents the product.
B represents the energy of activation when enzymes are present.
C is the free energy difference between A and D.
C is the energy of activation without enzymes.
E is the difference in free energy between the reactant and the products.
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The graph presented here depicts the activation energy, or the amount of energy needed for a reaction to proceed, with and without an enzyme. a. Which reaction requires more energy to proceed—the one with or without an enzyme? How do you know? b. Is this reaction anabolic or catabolic? How do you know?
An enzyme has a single active site at which it can bind and hydrolyze either X or Y but the enzyme cannot bind X and Y at the same
time. Which of the following statements are TRUE?
Multiple answers: Multiple answers are accepted for this question
Select one or more answers and submit. For keyboard navigation. SHOW MORE
The Km for X will be affected if Y is present in the reaction mixture.
a
Y is a competitive inhibitor of X.
The Km for X will increase.
d
The Vmax for X will be affected if Y is present in the reaction mixture.
pH dependence of Vmax reflects the ionization state of catalytic site residues.
e
Consider the following: X and Y are methanol (poisonous) and ethanol respectively. If the Km for X= 0.01 M and the Km
f
for Y = 0.001 M then 0.01 M Y is 10 times the concentration of Y required for 0.5 Vmax.
Addition of an enzyme to a chemical reaction increases the ratio of products to reactants (Ken).
A mutation in the active site of an enzyme resulting in a large increase in…
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.
Chapter 6 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 6.1 - Prob. 1SBCh. 6.1 - In thermodynamics, what is meant by an isolated...Ch. 6.2 - Prob. 1SBCh. 6.2 - Prob. 2SBCh. 6.2 - Distinguish between exergonic and endergonic...Ch. 6.3 - Prob. 1SBCh. 6.3 - How are coupled reactions important to cell...Ch. 6.4 - How do enzymes increase the rates of the reaction...Ch. 6.4 - Can enzymes alter the G of a reaction?Ch. 6.5 - Prob. 1SB
Ch. 6.5 - What is the difference between competitive and...Ch. 6.5 - Prob. 3SBCh. 6.6 - Prob. 1SBCh. 6 - The capacity to do work best defines: a metabolic...Ch. 6 - The assembly of proteins from amino acids is best...Ch. 6 - When two glucose molecules react to form maltose:...Ch. 6 - When glucose reacts with ATP to form...Ch. 6 - In the following graph: A represents the product....Ch. 6 - Which of the following methods is not used by...Ch. 6 - In an enzymatic reaction: a. the enzyme leaves the...Ch. 6 - Which of the following statements about the...Ch. 6 - Which of the following statements about inhibition...Ch. 6 - Which of the following statements is incorrect? a....Ch. 6 - Prob. 11TYKCh. 6 - Discuss Concepts Trace the flow of energy through...Ch. 6 - Prob. 13TYKCh. 6 - Prob. 14TYKCh. 6 - Prob. 15TYKCh. 6 - Prob. 16TYKCh. 6 - Prob. 17TYKCh. 6 - Prob. 1ITDCh. 6 - Prob. 2ITDCh. 6 - Prob. 3ITD
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- Which of the following are effects of catalyst that cause an increase in the rate of reaction? (This is a multi-select question. Select all that apply). a decrease in DG‡. an increase in DG. an increase in temperature. an increase in the energy of the molecules/ions of reactant. an increase in the number of molecules/ions of reactant with enough energy to overcome the activation energy barrier.arrow_forwardConsider a reaction in which reactants X and Y combine to form the product Z. The diagram below compares the reaction coordinates for the catalyzed and uncatalyzed pathways of this reaction. B. X+Y Reaction Coordinate What does letter B represent? O Letter B represents the activation energy of the uncatalyzed reaction pathway. Letter B represents the energy difference between the reactants and products for the uncatalyzed pathway. O Letter B represents the activation energy of the catalyzed reaction pathway. Letter B represents the energy difference between the reactants and products for the catalyzed pathway. Energyarrow_forwardEnzymes are biological catalysts that fulfill the following general reaction mechanism: E+S [ES] [EP] E + P Where E is enzyme, S is substrate, and P is product. Briefly describe how an enzyme is able to speed of the rate of a reaction:arrow_forward
- Here is a chemical reaction: H₂O2 -> O2 + H₂O What is/are the reactants? What is/are the products? H₂O2 is the product while O₂ and H₂O are reactants. There are no products or reactants as an enzyme is needed for the reaction to occur. There are no products or reactants as O2 and H₂O occur in the environment. O H₂O2 is the reactant while O₂ and H₂O are productsarrow_forwardIn the diagram, notice the y-coordinate (energy) of A + B; also notice how C is at a lower y-coordinate. Their difference is the amount of energy during the exothermic reaction. A+B Activation Energy Reaction Progression Energyarrow_forwardWhat statements concerning free energy change are true or false? a. Free energy change is a measure of the rate of a reaction. b. Free energy change is a measure of the maximum amount of work available from a reaction. c. Free energy change is a constant for a reaction under any conditions. d. Free energy is related to the equilibrium constant for a specific reaction. e. Free energy change is equal to zero at equilibriumarrow_forward
- The graph below shows an energy diagram for three chemical reactions. Pick your favorite one and indicate: the activation energy the transition state the free energy change for that reaction Draw a new curve on the graph to indicate how an enzyme that catalyzes the reaction will change the energetics.arrow_forwardDiscuss an enzyme that acts as a catalyst in a biological system. What reaction(s) does it catalyze? What kinds of problems arise if the enzyme isn't working properly? In what ways is the enzyme's activity regulated? Other interesting facts about the enzyme? Don't forget to cite your source(s).arrow_forwardWhich of the following aspects of catalysis by enzymes can NOT be explained by the Fischer Lock and Key Hypothesis? Enzymes will lower the activation energy barrier for reaction. Enzymes will specifically recognize their substrates. Appropriate substrates will bind to the enzyme to form a Michaelis complex. Enzymes have an "active site" where appropriate substrates will be bound. Two of the above cannot be explained by the Fischer "Lock and Key" Hypothesis.arrow_forward
- Imagine you are working in a lab, and you are performing two chemical reactions. You notice that Reaction A occurs much faster than Reaction B, and that both reactions release the same amount of heat. Which of the following conclusions can be made from your observation? Reaction A has the same activation energy as Reaction B, and the AG of Reaction A is more negative (i.e., a larger negative number) than the AG for Reaction B. Reaction A has a lower activation energy than Reaction B, and the AG of Reaction A is the same as the AG of Reaction B. Reaction A has a higher activation energy than Reaction B, and the AG of Reaction A is the same as the AG of Reaction B. Reaction A has the same activation energy as Reaction B, and the AG of Reaction A is less negative (i.e., a smaller negative number) than the AG for Reaction B.arrow_forwardWhich of the following statement/s is/are TRUE of enzymes? 1. They increase the rate of reaction by stabilizing the transition state. II. They raise activation energy to shift the equilibrium to favor the products. . They lower activation energy by altering the products of a reaction. O l and III O Il and III O III only o l onlyarrow_forwardSome cool enzyme (CE) catalyzes the conversion of compound F to compound A. Which of the following must be true of CE? Choice 1 of 4: CE can facilitate conversion of compound A into compound F. Choice 2 of 4: CE binds more tightly to the substrate F than to the product A. Choice 3 of 4: CE decreases the energy of the transition state between compounds F and A. Choice 4 of 4: CE facilitates net conversion of F to A whenever F is present.arrow_forward
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