Enzyme Specificity
Mediumchemistry
Lock-and-key model emphasizes enzyme specificity stemming from:
Select the correct option:
Solution
Incorrect! Answer:
Preformed complementary active site matching substrate
- Lock-and-Key Theory: Proposed by Emil Fischer.
- Concept: The enzyme (lock) has a specific, fixed 3D shape at its active site.
- Substrate (Key): Only a substrate with the exact complementary shape and charge distribution can fit into the active site.
- Consequence: This explains why enzymes are highly specific for their substrates.
- Comparison: The 'Induced Fit' model is slightly different, suggesting that the active site is flexible and molds around the substrate after binding.
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About This Question
- Subject
- chemistry
- Chapter
- biomolecules
- Topic
- enzyme specificity
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Preformed complementary active site matching substrate
- Lock-and-Key Theory: Proposed by Emil Fischer.
- Concept: The enzyme (lock) has a specific, fixed 3D shape at its active site.
- Substrate (Key): Only a substrate with the exact complementary shape and charge distribution can fit into the active site.
- Consequence: This explains why enzymes are highly specific for their substrates.
- Comparison: The 'Induced Fit' model is slightly different, suggesting that the active site is flexible and molds around the substrate after binding.
This medium difficulty chemistry question is from the chapter biomolecules, covering the topic of enzyme specificity. It appeared in the 2025 exam.
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