Biology for IGCSE & O level - Enzymes (Section 3 - No. 42)
Which of the following is the best description of the 'lock and key' model of enzyme action?
An enzyme's active site is flexible and changes shape to fit any substrate.
An enzyme and its substrate have complementary shapes, like a lock and key.
Enzymes are not specific and can bind to any substrate.
The enzyme breaks down the substrate into its components.
Explanation
The 'lock and key' model describes how an enzyme's active site has a specific shape that perfectly fits its substrate, like a lock and key.
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