Biology for IGCSE & O level - Enzymes (Section 4 - No. 6)
Which of the following statements best explains the lock and key model of enzyme action?
The enzyme changes shape to fit the substrate.
The enzyme binds to the substrate with a flexible active site.
The active site of the enzyme and the substrate have complementary shapes.
The enzyme breaks the substrate apart.
Explanation
The lock and key model says that the active site of the enzyme is designed to be compatible with the substrate, just like a lock and key.
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