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

Which of the following best describes the role of enzymes in biochemical reactions?

They are consumed during the reaction.

They lower the activation energy required for the reaction to proceed.

They change the overall free energy (9G) of the reaction.

They increase the equilibrium constant of the reaction.

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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 without being consumed in the process.

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 the reaction to occur.

Explain why enzymes do not change the overall free energy (ΔG): The free energy change of a reaction is determined by the difference in energy between reactants and products. Enzymes do not alter this intrinsic property; they only affect the rate of the reaction.

Discuss equilibrium constants: Enzymes do not change the equilibrium constant of a reaction. They help the reaction reach equilibrium faster but do not alter the position of equilibrium itself.

Conclude with the correct description: The best description of the role of enzymes is that they lower the activation energy required for the reaction to proceed, enabling faster reaction rates without being consumed or altering ΔG or equilibrium constants.