3. Energy & Cell Processes

Enzyme Inhibition

3. Energy & Cell Processes

Enzyme Inhibition

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01:09

BioInteractive: Gleevec

Bruce

00:39

Animation: Enzymes: Noncompetitive Inhibition

Bruce

00:55

Animation: Enzymes: Competitive Inhibition

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02:35

A Level Biology "Non-Competitive Inhibitors"

Freesciencelessons

05:11

A Level Biology Revision "Competitive Inhibitors"

Freesciencelessons

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Enzyme Inhibition IB Biology

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02:43

Enzymes, Feedback Inhibition, and Allosteric Regulation

jaqscimedia

05:13

Enzyme Function and Inhibition

National Center for Case Study Teaching in Science

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Practice this topic

Multiple Choice

Which of the following statements correctly describes competitive inhibition?

a) A competitive inhibitor binds to the substrate and inhibits it from binding to the active site of the enzyme.

b) A competitive inhibitor binds to a site other than the active site and inhibits the substrate from binding.

c) A competitive inhibitor binds to the active site and degrades the enzyme.

d) A competitive inhibitor binds to the active site of an enzyme and inhibits the substrate to bind.

Has a video solution.

Multiple Choice

How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?

a) By binding to the active site of the enzyme, thus preventing binding of the normal substrate.

b) By binding to an allosteric site, thus changing the shape of the active site of the enzyme.

c) By decreasing the free-energy change of the reaction catalyzed by the enzyme.

d) By binding to the substrate, thus changing its shape so that it no longer binds to the active site of the enzyme.

Has a video solution.

Multiple Choice

Which of the following types of enzyme inhibition is overcome by increasing the substrate concentration?

a) The need for a coenzyme.

b) Noncompetitive inhibition.

c) Competitive inhibition.

d) None of the above.

Has a video solution.

Multiple Choice

The binding of an allosteric inhibitor to an enzyme causes the rate of product formation by the enzyme to decrease. Which of the following best explains why this decrease occurs?

Multiple Choice

Which of the following statements about allosteric proteins is/are true?

Multiple Choice

The process of stabilizing the structure of an enzyme in its active form by the binding of a molecule outside the active site is an example of __________.

Multiple Choice

Which of these statements about enzyme inhibitors is true?

Multiple Choice

Succinylcholine is structurally almost identical to acetylcholine. If succinylcholine is added to a mixture that contains acetylcholine and the enzyme that hydrolyzes acetylcholine (but not succinylcholine), the rate of acetylcholine hydrolysis is decreased. Subsequent addition of more acetylcholine restores the original rate of acetylcholine hydrolysis. Which of the following correctly explains this observation?

Textbook Question

Sometimes inhibitors can be harmful to a cell; often they are beneficial. Explain.

Has a video solution.

Textbook Question

Organophosphates (organic compounds containing phosphate groups) are commonly used as insecticides to improve crop yield. Organophosphates typically interfere with nerve signal transmission by inhibiting the enzymes that degrade transmitter molecules. They affect humans and other vertebrates as well as insects. Thus, the use of organophosphate pesticides poses some health risks. On the other hand, these molecules break down rapidly upon exposure to air and sunlight. As a consumer, what level of risk are you willing to accept in exchange for an abundant and affordable food supply?

Has a video solution.

Textbook Question

Many drugs and poisons exert their effects by blocking one or more enzymes. How could blocking an enzyme lead to the death of a cell?

Has a video solution.

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