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

How does an enzyme affect the rate of biological reactions?

It has no effect on the reaction rate.

It decreases the reaction rate by increasing the activation energy.

It increases the reaction rate by providing additional reactants.

It increases the reaction rate by lowering the activation energy.

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Verified step by step guidance

Understand the role of enzymes in biological reactions: Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process.

Learn about activation energy: Activation energy is the minimum energy required for a chemical reaction to occur. Enzymes work by lowering this energy barrier, making it easier for reactants to convert into products.

Recognize how enzymes interact with substrates: Enzymes bind to specific reactants (called substrates) at their active site, forming an enzyme-substrate complex. This stabilizes the transition state and reduces the activation energy.

Clarify the effect on reaction rate: By lowering the activation energy, enzymes increase the rate of the reaction, allowing it to proceed faster under physiological conditions.

Understand why the other options are incorrect: Enzymes do not provide additional reactants, nor do they increase activation energy or have no effect on reaction rate. Their primary function is to lower activation energy and accelerate the reaction.