Multiple Choice
The active site of an enzyme is the region that _____.
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6. Enzymes and Enzyme Kinetics
Enzyme-Substrate Complex
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The lock-and-key mechanism refers to:
A
The process by which enzymes are denatured at high temperatures.
B
The ability of an enzyme to change its shape to accommodate the substrate.
C
The specific fit between an enzyme's active site and its substrate, similar to how a key fits into a lock.
D
The irreversible binding of an inhibitor to an enzyme.
Verified step by step guidance1
Understand the concept of the lock-and-key mechanism: This model describes how enzymes and substrates interact. Enzymes have a specific active site that matches the shape of their substrate, similar to how a key fits into a lock.
Clarify that the lock-and-key mechanism emphasizes specificity: The enzyme's active site is complementary in shape to the substrate, ensuring that only the correct substrate can bind.
Differentiate the lock-and-key mechanism from other models: For example, the induced fit model suggests that the enzyme's active site can adjust its shape slightly to better fit the substrate, which is different from the rigid specificity of the lock-and-key model.
Eliminate incorrect options: High temperatures denature enzymes by disrupting their structure, which is unrelated to the lock-and-key mechanism. Irreversible binding of inhibitors is also unrelated to this concept.
Conclude that the correct answer is: 'The specific fit between an enzyme's active site and its substrate, similar to how a key fits into a lock,' as this best describes the lock-and-key mechanism.
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