_7.Penicillin is an example of what type of enzyme inhibitor?A. CompetitiveB. NoncompetitiveC. UncompetitiveD. Irreversible_8.What type of inhibition is observed from the shift of the Lineweaver-Burke plot showm inthe graph below where the solid line represents the uninhibited enzymatic reaction while thebroken line represents the inhibited enzymatic reaction?A. Irreversible inhibitionB. Noncompetitive inhibitionC. Competitive inhibitionD. Uncompetitive inhibition1/v1/SPotassium cyanide is a poison which combines with cytochrome A3 to prevent bindingof oxygen to the enzyme without altering the Km of the reaction with respect to reducedcytochrome c. Which type of inhibition does this represent?A. Irreversible inhibitionB. Noncompetitive_9.C. Competitive inhibitionD. Uncompetitive inhibitioninhibition

Penicillium affects bacterial growth by inhibiting cell wall synthesis. It is an antibiotic that…

Answered: Penicillin is an example of what A.…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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The Vmax of an enzymatic reaction can be increased by _______________. A. Increasing the enzyme concentration only. B. Increasing the substrate concentration only. C. Removing a non-competitive inhibitor. D. Removing a competitive inhibitor. E. A and C F. A, C, and D
What is true about a competitive inhibitor of an enzyme? You can choose more than one a. it binds the active site b. it binds an allosteric site c. it physically blocks the substrate d. it warps the active site e. it can be overcome with large amounts of substrate
All of the following statements about competitive and non-competitive inhibitors are true EXCEPT:(a) Competitive inhibitors are structurally similar to anenzyme’s substrate and bind to the enzyme’s allostericsite.(b) Competitive inhibitors work by competing with a sub-strate for binding to an enzyme’s active site.(c) Noncompetitive inhibitors can bind at sites other thanthe active site of an enzyme, distorting the tertiary pro-tein structure, which alters the shape of the active site,rendering it ineffective for substrate binding.(d) Some noncompetitive inhibitors bind reversibly whilesome bind irreversibly to their enzyme.(e) b and d.
The 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.
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.
How can a noncompetitive inhibitor affect enzymeactivity without binding to the active site?a. It binds to another location on the enzyme, altering the active site shape.b. It physically blocks the entrance to the active site.c. It alters the shape of the substrate, making it difficult for it to bind to theactive site.d. It degrades the substrate.
Item 35 Organic cofactors are referred to as _________. Fill in the blank 36 Item 36 Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the Multiple Choice a. allosteric site, and its effectiveness is not influenced by substrate concentration. b. allosteric site, and its effectiveness depends on substrate concentration. c. active site, and its effectiveness is not influenced by substrate concentration. d. active site, and its effectiveness depends on substrate concentration. e.substrate, and its effectiveness depends on product concentration.
Indicate whether each of the following statements describes a reversible competitive inhibitor, a reversible noncompetitive inhibitor, or an irreversible inhibitor. More than one answer may apply.a. Both inhibitor and substrate bind at the active site on a random basis.b. The inhibitor effect cannot be reversed by the addition of more substrate.c. Inhibitor structure does not have to resemble substrate structure.d. The inhibitor and substrate can bind to the enzyme simultaneously
1. How much faster is a reaction with the faster enzyme than without a catalyst? * A. Approximately 10 times faster. B. About 100 times faster. C. Approximately 1,000 times faster. D. About 10,000 times faster. E. About 10X^20 times faster. 2. For competitive inhibition * A. KM value decreases B. the value of Vmax decreases C. it is possible to overcome the effect of the inhibitor by increasing the concentration of substrate D. None of the above
Inhibitor X exerts which of the following effects on the above enzyme (maltase)? (inhibitor X changes maltase activity to a Vo of 0.10 mM per minute when [S] = 0.125 mM, and a Vo of 0.25 mM per minute when [S] = 0.50 mM) competitive inhibition pure non-competitive inhibition uncompetitive inhibition all of the above none of the above
Which statement is/are TRUE about inhibitors? A. Mode of action of penicillin on bacteria is an example of irreversible inhibition. B. Increasing the substrate concentration does not affect competitive inhibitors C. Uncompetitive inhibitors bind only to the enzyme-substrate complex D. In the Lineweaver-Burke plot, the lines for enzymes in the presence and absence of noncompetitive inhibitor have different x-intercepts.
A noncompetitive inhibitor (Circle one). a. Binds at the active site of the enzyme. b. Alters the three-dimensional structure of the enzyme. c. Increases the rate of the enzyme-catalyzed reaction. d. Has a structure similar to the substrate. e. Has its effect reversed by adding more substrate.

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