Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 5MC
Which of the following is False?
a. Allosteric inhibition is noncompetitive.
b. Allosteric regulation can either stimulate or inhibit enzyme activity.
c. Feedback inhibition is a form of allosteric regulation.
d. Competitive inhibition is a form of allosteric enzyme regulation.
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Students have asked these similar questions
An enzyme has the ability to catalyze reactions of several unrelated compounds. The mechanism of how this enzyme operates is best explained by
a. the lock-and-key theory
b. the induced-fit theory
c. the enzyme-substrate complex
d. the efficiency of the enzyme
Which of the following statements about Competitive and noncompetitive inhibition is false?
a. A noncompetitive inhibitor does not change the Km of the enzyme.
b. A competitive inhibitor does not change the Vmax of the enzyme
c. The noncompetitive inhibitor can bind either free enzyme or the enzyme–substrate complex.
d.A competitive inhibitor decreases the apparent Km for a given substrate.
What is it called when the final product of an enzymatic pathway acts as a modulator for the first enzyme in the pathway?
a. isoenzyme activation
b. relative specificity
c. feed back inhibition
d. competitive inhibition
Chapter 6 Solutions
Biology: Life on Earth (11th Edition)
Ch. 6 - Which of the following is True? a. Enzymes...Ch. 6 -
2. Which is not an example of an exergonic...Ch. 6 - Which of the following is True? ATP is a long-term...Ch. 6 - Prob. 4MCCh. 6 - Which of the following is False? a. Allosteric...Ch. 6 -
1. According to the first law of thermodynamics,...Ch. 6 - Prob. 2FTBCh. 6 - Prob. 3FTBCh. 6 - The abbreviation ATP stands for ___. The molecule...Ch. 6 -
5. Enzymes are what type of biological molecule?...
Ch. 6 - Prob. 6FTBCh. 6 - Prob. 1RQCh. 6 -
2. Define potential energy and kinetic energy and...Ch. 6 -
3. Define metabolism, and explain how reactions...Ch. 6 - Prob. 4RQCh. 6 - Compare breaking down glucose in a cell to setting...Ch. 6 - Compare the mechanisms of competitive and...Ch. 6 - Describe the structure and function of enzymes....Ch. 6 - 1. While vacuuming, you show off by telling a...Ch. 6 - 2. Refute the following: “According to...Ch. 6 - Prob. 3AC
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- the type of enzyme inhibition in which covalent bulky adduct prevents catalysis is ? a) uncompetitive b) reversible c) noncompetitive d) competitive e) Irreversiblearrow_forwardWhich type of enzyme regulation is best for the following situations?(a) An enzyme that becomes overactive during a disease(b) An enzyme needed only when there is low blood glucose(c) An enzyme that springs into action when a traumatic injury occurs(d) An enzyme needed only during adolescencearrow_forwardWhich statements are true of an inhibitor that binds the active site of an enzyme? Select all that apply, there may be one correct answer or several. a These inhibitors are a kind of allosteric regulator that decreases enzyme activity. b Adding more substrate can reduce the effect of these inhibitors. c These inhibitors compete with the substrate for the active site of the enzyme. d These inhibitors increase the rate of enzyme activity. e These inhibitors function by changing the shape of the enzyme, stopping if from binding to substrate.arrow_forward
- In 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_forwardWhich of the following is not true about enzymes?a. They are consumed by the reactions they catalyze.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_forwardThe image shows the rate of an enzyme reaction under conditions of no inhibition, competitive inhibition, and noncompetitive inhibition as reactions labeled uninhibited, A, and B. Which of the following best explains what has occurred in the enzyme reactions? Reaction B shows competitive inhibition, where increased substrate competes with inhibitors for the active site. Reaction A shows noncompetitive inhibition, where increased substrate competes with inhibitors for the active site. Reaction A shows competitive inhibition, where increased substrate does not affect the enzyme’s binding with the inhibitor. Reaction B shows noncompetitive inhibition, where increased substrate does not affect the enzyme’s binding with the inhibitor.arrow_forward
- The mechanism in which the end product of a metabolic pathway inhibits an either step in the pathway is known as A. Reversible inhibition B. Metabolic inhibition C. Feedback inhibition D. Allosteric inhibition E. Noncoopetative inhibitionarrow_forwardWhat is the reason why the transition state of a catalyzed reaction is lower has lower energy compared to an uncatalyzed reaction? A. because enzymes only work at low temperatures B. because of favorable interactions with the substrate C. because of enthalpic interactions between the enzyme and the transition state D. A and Barrow_forwardMolecule X is expected to be a non-competitive inhibitor of an enzyme. If the inhibitor was tested at a saturating level of substrate the following would be observed: a. The inhibitor would decrease the Vmax b. The inhibitor would increase the Km c. The inhibitor would decrease the Km d. The inhibitor would increase the Vmax e. The inhibitor would not change the Vmaxarrow_forward
- 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 catalyzearrow_forward________ is a regulatory mechanism in which the end product of a metabolic pathway inhibits an enzyme that catalyzes an early step in the pathway. a. Cooperative inhibition b. Feedback inhibition c. Allosteric inhibition d. Non-competitive inhibition e. Metabolic inhibitionarrow_forwardWhich 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 reactionarrow_forward
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