Which of the following statements about allosteric enzyme regulations are true. A. Allosteric regulations is always used to negatively regulate enzyme activity. B. Allosteric regulations are often end products of a biochemical pathway. C. Diffrent allosteric regulators turn enzyme activity on or off by binding the same site. D. Binding of allosteric regulators alters the conformation of an enzyme. B only B and C B and D D only A and D

Which of the following statements about allosteric enzyme regulations are true. A. Allosteric regulations is always used to negatively regulate enzyme activity. B. Allosteric regulations are often end products of a biochemical pathway. C. Diffrent allosteric regulators turn enzyme activity on or off by binding the same site. D. Binding of allosteric regulators alters the conformation of an enzyme. B only B and C B and D D only A and D

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 5RQ: Which of the following is not true about enzymes? a. They are consumed by the reactions they...

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Which 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.
Which of the following is true about allosteric enzymes? A. Allosteric enzymes are always multimeric. B. Regulatory sites (allosteric sites) on an allosteric enzyme are always different from the catalytic site. C. Allosteric enzymes always change the conformation of the active site in response to binding of an allosteric modulator. D. Suicide inactivators are examples of allosteric modulators.
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 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 adolescence
Which of the following is true for the induced-fit model of enzyme-substrate binding? A. The conformation of the enzyme’s active site changes when the enzyme binds to its substrate B. Stronger interactions between the enzyme and its substrate are formed as compared to the lock-and-key model of enzyme-substrate binding C. Both A and B D. Neither A nor B Which statement does not apply to transition states? A. only exist transiently (have lifetimes on the order of 10^-14 to 10^-13 seconds) B. differ in energy from the substrate by the activation energy C. Chemical bonds are in the process of being formed and broken. D. Many have been detected and purified experimentally.
Which of the following analogies best describes the induced-fit model of enzyme-substrate binding? a. a hug between two people b. a key fitting into a lock c. a square peg fitting through the square hole and a round peg fitting through the round hole of a children’s toy d. the fitting together of two jigsaw puzzle pieces
a primary reason that enzymes are necessary to life is that a. the are portenin coded for in DNA b. activation energies of most biological reactions are too high for the reaction to proceed fast enough for a cells requirements c. activation energies of most biological reactions are too low for the reaction to proceed fast enough for a cells requirements d. enzymes are helpful to life, but not necessary
the type of enzyme inhibition in which covalent bulky adduct prevents catalysis is ? a) uncompetitive b) reversible c) noncompetitive d) competitive e) Irreversible
Characterization of enzyme activity does not allow us to: a. determine how different variables affect the enzyme's ability to function b. determine the molecular composition of the enzyme c. determine the optimal environment for an enzyme to function d. determine the effect of inhibitors on the enzyme
Which 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.
An enzyme has 10 times greater affinity for substrate "A" than for substrate "B". Which of the following is true? a.) KM of A is 10 times the KM of B b.) The concentration of B is 10 times that of A c.) Vmax of A is 1/10 the Vmax of B d.) KM of A is 1/10 the KM of B e.) Vmax of A is 10 times the Vmax of B
In the metabolic pathway, A->B->C->D->E what effect would molecule E likely have on the enzyme that catalyzes A->B? (The answer is A. Could you justify the reason why the answer is A?) a) Allosteric inhibitor b)Allosteric activator c) Competitive inhibitor d) feedback activator e) coenzyme