Singapore GCE A-Level Exam

What is the lock-and-key model of enzyme action?

Enzymes break apart like keys The substrate fits precisely into the enzyme's active site, like a key fitting a lock, forming an enzyme-substrate complex Enzymes are made of metal like locks The enzyme changes shape to fit the substrate

Correct Answer:

The substrate fits precisely into the enzyme's active site, like a key fitting a lock, forming an enzyme-substrate complex

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