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

Enzyme-Substrate Complex

Biochemistry

6. Enzymes and Enzyme Kinetics

Enzyme-Substrate Complex

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Multiple Choice

After an enzyme catalyzes a reaction, what typically happens to the enzyme?

It is permanently altered and cannot be reused.

It becomes part of the product formed.

It is released unchanged and can catalyze another reaction.

It is degraded by the cell immediately after the reaction.

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Verified step by step guidance

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

Recognize the mechanism of enzyme action: During a reaction, the enzyme binds to the substrate to form an enzyme-substrate complex, facilitates the conversion of the substrate into the product, and then releases the product.

Clarify the fate of the enzyme: After the reaction, the enzyme is released unchanged and retains its original structure and functionality, allowing it to catalyze additional reactions.

Eliminate incorrect options: (1) Enzymes are not permanently altered, so they can be reused. (2) Enzymes do not become part of the product; they remain separate. (3) Enzymes are not immediately degraded after the reaction; they are stable and reusable under normal conditions.

Conclude with the correct understanding: The enzyme is released unchanged and can catalyze another reaction, which is a key feature of enzymatic activity.