BI-1315
Lock-and-key model
Biology · Secondary 4 · Medium · Lock-and-key model
The diagram shows an enzyme and its substrate. Which statement best describes how the lock-and-key model explains enzyme action?
- The enzyme changes its active site to fit any substrate
- The substrate changes shape to fit any enzyme
- The active site has a fixed shape that fits only a specific substrate
- The enzyme and substrate have identical overall shapes
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