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

Which of the following best describes product formation in enzyme-catalyzed reactions?

The enzyme increases the activation energy required for the substrate to become product.

The enzyme permanently binds to the substrate, forming a stable product-enzyme complex.

The enzyme binds the substrate to form an enzyme-substrate complex, lowers the activation energy, and then releases the product.

The substrate is converted to product without any interaction with the enzyme.

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Verified step by step guidance

Step 1: Begin by understanding 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.

Step 2: Recall the mechanism of enzyme action. Enzymes bind to substrates to form an enzyme-substrate complex. This binding occurs at the enzyme's active site, which is specific to the substrate.

Step 3: Understand how enzymes lower activation energy. The enzyme stabilizes the transition state, making it easier for the substrate to be converted into the product. This does not involve the enzyme permanently binding to the substrate or forming a stable product-enzyme complex.

Step 4: Note that enzymes are not consumed in the reaction. After the product is formed, the enzyme releases the product and is free to catalyze another reaction cycle.

Step 5: Eliminate incorrect options based on the above understanding. The correct description is: 'The enzyme binds the substrate to form an enzyme-substrate complex, lowers the activation energy, and then releases the product.'