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

Why is the "lock and key" analogy often used to describe enzyme function?

Because the enzyme's active site has a specific shape that fits only a particular substrate, similar to how a key fits into a specific lock.

Because enzymes permanently bind to substrates and are not reused.

Because the enzyme changes its shape drastically to accommodate any substrate.

Because enzymes can catalyze any reaction regardless of substrate shape.

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Verified step by step guidance

Understand the concept of enzyme specificity: Enzymes are biological catalysts that speed up chemical reactions by lowering the activation energy. They are highly specific to their substrates, meaning they only bind to particular molecules based on their shape and chemical properties.

Learn about the 'lock and key' analogy: This analogy is used to describe how the enzyme's active site has a specific shape that matches the substrate, similar to how a key fits into a specific lock. This specificity ensures that enzymes catalyze only certain reactions.

Eliminate incorrect options: Review the provided choices and eliminate those that contradict the principles of enzyme function. For example, enzymes do not permanently bind to substrates; they release the product after the reaction and are reused. Additionally, enzymes do not drastically change their shape to accommodate any substrate, nor can they catalyze reactions regardless of substrate shape.

Focus on the correct explanation: The correct answer highlights the specificity of the enzyme's active site and its compatibility with a particular substrate, which aligns with the 'lock and key' analogy.

Summarize the reasoning: The 'lock and key' analogy is appropriate because it emphasizes the precise fit between an enzyme's active site and its substrate, ensuring that only specific reactions are catalyzed efficiently.