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 theory is commonly used to model how enzymes interact with their substrates?

Central dogma

Induced fit model

Fluid mosaic model

Lock and key model

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Verified step by step guidance

Step 1: Understand the context of the question. The problem is asking about a theory that explains how enzymes interact with their substrates, which is a fundamental concept in enzymology.

Step 2: Review the key theories mentioned in the options: (1) Central dogma, which describes the flow of genetic information (DNA -> RNA -> Protein), and is unrelated to enzyme-substrate interaction. (2) Fluid mosaic model, which explains the structure of cell membranes, also unrelated to enzyme-substrate interaction. (3) Lock and key model, which suggests that enzymes and substrates fit together like a key in a lock, emphasizing specificity. (4) Induced fit model, which proposes that enzymes undergo conformational changes to better fit the substrate upon binding.

Step 3: Compare the lock and key model with the induced fit model. The lock and key model assumes a rigid fit, while the induced fit model accounts for flexibility and dynamic changes in enzyme structure, which is more consistent with experimental evidence.

Step 4: Recognize that the induced fit model is the commonly accepted theory for enzyme-substrate interaction because it explains how enzymes adapt their shape to bind substrates more effectively, enhancing catalytic activity.

Step 5: Conclude that the correct answer is the induced fit model, as it is widely used to describe enzyme-substrate interactions in modern biochemistry.