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 is NOT a way in which an enzyme can speed up the reaction that it catalyzes?

By providing an alternative reaction pathway

By lowering the activation energy required for the reaction

By increasing the free energy change ($\Delta G$) of the reaction

By stabilizing the transition state of the substrate

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Verified step by step guidance

Understand the role of enzymes in catalysis: Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They achieve this by lowering the activation energy required for the reaction, stabilizing the transition state, and providing an alternative reaction pathway.

Clarify the concept of activation energy: Activation energy is the energy barrier that must be overcome for a reaction to proceed. Enzymes lower this barrier, making it easier for reactants to convert into products.

Explain the transition state stabilization: Enzymes stabilize the transition state, which is the high-energy intermediate formed during the reaction. This stabilization reduces the energy required to reach the transition state, thereby accelerating the reaction.

Discuss free energy change ($\Delta G$): The free energy change of a reaction ($\Delta G$) determines whether a reaction is thermodynamically favorable. Enzymes do not alter $\Delta G$; they only affect the rate at which equilibrium is reached, not the position of equilibrium itself.

Identify the incorrect statement: Since enzymes do not increase the free energy change ($\Delta G$) of a reaction, this is NOT a mechanism by which they speed up reactions. The other options correctly describe how enzymes function.