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

Which of the following statements is false regarding inhibitors & enzyme-catalyzed reactions?

The V_max of an enzyme-catalyzed reaction will never increase in the presence of an enzyme-inhibitor.

Enzyme inhibitors can be secreted via exocytosis to defend against harmful threats.

At saturating [S], the rate is directly proportional to [enzyme].

The E_A for catalyzed & uncatalyzed reactions are equal, but the K_eq is more favorable in a catalyzed reaction.

Binding of an inhibitor to an enzyme can be reversible or irreversible.

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Verified step by step guidance

Understand the role of enzyme inhibitors: Enzyme inhibitors are molecules that decrease the activity of enzymes. They can bind to enzymes and reduce their activity, either reversibly or irreversibly.

Review the concept of Vmax: Vmax is the maximum rate of an enzyme-catalyzed reaction when the enzyme is saturated with substrate. In the presence of an inhibitor, Vmax can decrease, but it will not increase.

Consider the effect of substrate concentration: At saturating substrate concentrations, the reaction rate is directly proportional to the enzyme concentration, as all enzyme active sites are occupied by the substrate.

Examine the statement about activation energy (EA) and equilibrium constant (Keq): The activation energy for catalyzed reactions is lower than for uncatalyzed reactions, which increases the reaction rate. However, the equilibrium constant (Keq) is not affected by the presence of a catalyst; it remains the same for both catalyzed and uncatalyzed reactions.

Evaluate the secretion of enzyme inhibitors: Enzyme inhibitors can indeed be secreted by cells via exocytosis as a defense mechanism against harmful threats, such as pathogens or toxins.