Table of contents

1. Introduction to Biochemistry4h 34m
2. Water3h 23m
3. Amino Acids8h 10m
4. Protein Structure10h 4m
5. Protein Techniques14h 5m
6. Enzymes and Enzyme Kinetics13h 38m
7. Enzyme Inhibition and Regulation 8h 42m
8. Protein Function 9h 41m
9. Carbohydrates7h 49m
10. Lipids5h 49m
11. Biological Membranes and Transport 6h 37m
12. Biosignaling9h 45m
Review 1: Nucleic Acids, Lipids, & Membranes2h 47m
Review 2: Biosignaling, Glycolysis, Gluconeogenesis, & PP-Pathway3h 12m
Review 3: Pyruvate & Fatty Acid Oxidation, Citric Acid Cycle, & Glycogen Metabolism2h 26m
Review 4: Amino Acid Oxidation, Oxidative Phosphorylation, & Photophosphorylation1h 48m

7. Enzyme Inhibition and Regulation

Enzyme Inhibition

Biochemistry

7. Enzyme Inhibition and Regulation

Enzyme Inhibition

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Multiple Choice

What type of enzyme inhibition occurs when a chemical substance binds to an enzyme and alters its shape, thereby affecting its activity?

Noncompetitive inhibition

Uncompetitive inhibition

Competitive inhibition

Allosteric activation

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Verified step by step guidance

Understand the concept of enzyme inhibition: Enzyme inhibitors are molecules that interact with enzymes to decrease their activity. They can bind to the active site or other regions of the enzyme, altering its function.

Review the types of enzyme inhibition: Competitive inhibition occurs when an inhibitor competes with the substrate for the active site. Noncompetitive inhibition involves an inhibitor binding to a site other than the active site, altering the enzyme's shape and activity. Uncompetitive inhibition occurs when the inhibitor binds only to the enzyme-substrate complex. Allosteric activation refers to a molecule binding to an enzyme at a site other than the active site, increasing its activity.

Focus on the mechanism described in the problem: The question specifies that the chemical substance binds to the enzyme and alters its shape, which affects its activity. This is characteristic of noncompetitive inhibition, where the inhibitor binds to an allosteric site and changes the enzyme's conformation.

Compare the options provided: Noncompetitive inhibition matches the description in the problem. Uncompetitive inhibition requires the enzyme-substrate complex, which is not mentioned here. Competitive inhibition involves direct competition for the active site, which is also not described. Allosteric activation increases activity, not decreases it.

Conclude the reasoning: Based on the description and comparison of the options, the type of enzyme inhibition described in the problem is noncompetitive inhibition.