Which statement is incorrect about Lock and Key Model________________?
Correct answer: D. It explains the mechanism of every chemical reaction
- A. Specific enzyme can transform only a specific substrate
- B. Active site of an enzyme is a non flexible structure
- C. Active site does not change before during or even after the reaction
- D. It explains the mechanism of every chemical reaction
Explanation
The lock-and-key model proposes a relatively rigid active site and specificity between an enzyme and its substrate, but it does not explain every chemical reaction. Students may choose c because the model treats the active site as unchanged, but d is the broader and incorrect claim.
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About Mode of Enzyme Action
Enzyme action depends on the active site forming a temporary enzyme substrate complex, then converting substrate into products with lower activation energy. The lock and key and induced fit models explain specificity and binding, while cofactors and changes in enzyme shape can affect catalysis.
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