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

6. Enzymes and Enzyme Kinetics

Enzymes

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzymes

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Multiple Choice

Consider the reaction: \( S \rightarrow P \). What effects are produced by an enzyme on this general reaction?

The enzyme changes the equilibrium position of the reaction in favor of product formation.

The enzyme increases both the activation energy and the overall free energy change (\( \Delta G \)).

The enzyme lowers the activation energy, increasing the reaction rate without altering the overall free energy change (\( \Delta G \)).

The enzyme is consumed during the reaction and cannot be reused.

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Verified step by step guidance

Understand the role of enzymes in biochemical reactions: Enzymes are biological catalysts that speed up reactions by lowering the activation energy required for the reaction to proceed. They do not alter the equilibrium position or the overall free energy change ( abla G).

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

Explain the relationship between enzymes and reaction rate: By lowering the activation energy, enzymes increase the rate at which the reaction reaches equilibrium. However, they do not change the equilibrium position itself, as this is determined by the thermodynamics of the reaction.

Address the misconception about enzyme consumption: Enzymes are not consumed during the reaction. They remain unchanged and can be reused for multiple reaction cycles, making them highly efficient catalysts.

Summarize the correct answer: The enzyme lowers the activation energy, thereby increasing the reaction rate, but it does not alter the overall free energy change ( abla G) or the equilibrium position of the reaction.