BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 6, Problem 2A
Which of the following statements is NOT true about enzymes?
a. Enzymes use the three-dimensional shape of their active site to bind reactants.
b. Enzymes lower the activation energy for a reaction.
c. Enzymes make ΔG for a reaction more negative.
d. Enzymes can catalyze the forward and reverse directions of a reaction.
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Students have asked these similar questions
Which of the following statement regarding enzymes is false?
a.) they speed up reaction rates
b.) they work within narrow temperature and pH ranges
c.) The active site binds the substarate
d.) They are consumed in the reactions they catalyze
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
Which of the following is NOT true of enzymes?
a) They may interact chemically with their substrates
b) They may catalyze a reaction in both forward and reverse directions.
c) They may alter Keq for the reaction that they catalyze.
d) They may decrease the entropy of their substrates.
Chapter 6 Solutions
BIOLOGY
Ch. 6.1 - Prob. 1LOCh. 6.1 - Prob. 2LOCh. 6.1 - Describe the nature of redox reactions.Ch. 6.2 - Explain the laws of thermodynamics.Ch. 6.2 - Prob. 2LOCh. 6.2 - Contrast the course of a reaction with and without...Ch. 6.3 - Describe the role of ATP in short-term energy...Ch. 6.3 - Prob. 2LOCh. 6.4 - Discuss the specificity of enzymes.Ch. 6.4 - Explain how enzymes bind to their substrates.
Ch. 6.4 - Prob. 3LOCh. 6.5 - Prob. 1LOCh. 6.5 - Prob. 2LOCh. 6.5 - Prob. 3LOCh. 6 - Prob. 1DACh. 6 - A covalent bond between two atoms represents what...Ch. 6 - During a redox reaction the molecule that gains an...Ch. 6 - Prob. 3UCh. 6 - A spontaneous reaction is one in which a. the...Ch. 6 - Prob. 5UCh. 6 - Which of the following is NOT a properly of a...Ch. 6 - Where is the energy stored in a molecule of ATP?...Ch. 6 - Prob. 1ACh. 6 - Which of the following statements is NOT true...Ch. 6 - Prob. 3ACh. 6 - Prob. 4ACh. 6 - Enzymes have similar responses to both changes in...Ch. 6 - Prob. 6ACh. 6 - Examine the graph showing the rate of reaction...Ch. 6 - Phosphofructokinase functions to add a phosphate...
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- Which of the following is not true about enzymes: a. They increase ΔG of reactions. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.arrow_forwardWhich of the following statements regarding enzymes is true? A. Enzymes decrease the free energy change of a reaction. B. Enzymes cjange the direction of chemical reaction. C. Enzymes prevent changes in substrate concentrations. D. Enzymes increase the rate of a reaction. E. Enzymes are permanently altered by the reactions they catalyze.arrow_forwardIn a highly high-temperature environment, you placed an enzyme and some substrates. You've seen that there hasn't been any reaction. Applying what you have learned on enzyme activity, how would you explain what occurred? A. The enzyme was not placed at a pH level that would allow it to react at its maximum rate. B. There are not enough enzymes for the reaction to occur. C. The enzyme may have denatured or broken down due to the high temperature of the environment, resulting in no reaction. D. There are not enough substrates for reaction to occur. Substrate concentration affects enzyme activity. Determine what would occur when there are too many substrates and fewer enzymes? A. No enzyme activity would occur. B. The reaction rate would continuously increase. C. The reaction would speed up tremendously. D. Maximal rate of reaction would occur. Enzyme activity mainly involves the active site and the substrate. How would you compare the active site from the substrate? A. The substrate…arrow_forward
- Enzymes work by at least three mechanisms. Which of the following is NOT a mechanism by which enzymes function? A. by putting reactants in close proximity to each other. B. by altering the free energy ( ΔG) of the reaction. C. by orienting the reactants so they are positioned to favour the transition state. D. by altering the immediate environment of the reactants to promote reactant interactions.arrow_forwardWhich of the following is NOT true about enzymes A. they do not alter reaction equilibria B. they accelerate the forward rate of a reaction C. they decrease ∆G’0 of a reaction D. they accelerate the reverse rate of a reaction E. they stabilize transition statesarrow_forwardSubstance A is converted to substance B in a metabolic reaction. Which statement best describes the role of enzyme during this reaction? A. It dissolves substance A in the reaction medium. B. It speeds up the reaction without it being consumed in the process. C. It provides energy to the reaction system D. It adjusts the pH of the reaction medium.arrow_forward
- Which of the following is TRUE about the enzymatic catalysis of a chemical reaction? A. It increases the energy of the transition state B. It decreases the free energy ∆G so that a reaction can proceed spontaneously C. It decreases the energy of the transition state D. It increases the forward and reverse ratesarrow_forwardWhich of the following statements are correct about how enzymes accelerate chemical reactions (select all that apply)? A. Enzymes bind substrates to raise their effective concentration B. Enzymes enhance the rate of a chemical reaction C. Enzymes catalyze chemical reactions by destabilizing transition states D. Side chains of protein provide reactive groups that facilitate reaction E. Enzymes shift the equilibrium of a chemical reaction to favor product formationarrow_forwardEnzymes catalyze a chemical reaction by A. decreasing the amount of ATP required to activate a reaction B. increasing the amount of ATP required to activate a reaction C. slowing down the reaction to obtain more products D. increasing the reaction to obtain more products E. decreasing the amount of ATP required and obtaining more products.arrow_forward
- Which of the following statements concerning enzymes is TRUE? a. Enzymes can increase the equilibrium constant of a reaction by 1000-fold. b. The activity of many enzymes can be regulated. c. Many enzymes are consumed in the reactions they catalyze. d. The rate of enzymatic catalysis is independent of pH.arrow_forwardWhich statement is true regarding the function of a catalyst in a chemical reaction? a) A catalyst increases the rate of a reaction. b) A catalyst provides an alternate mechanism for the reaction. c) A catalyst is not consumed by the reaction. d) All of the above are true.arrow_forwardWhich 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 Carrow_forward
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