BI-125
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
An enzyme catalyses the breakdown of a substrate into products. Which statement best describes how the lock‑and‑key model explains this reaction?
- The enzyme changes shape to fit any substrate.
- The substrate’s shape is unimportant for binding.
- Only a substrate with a complementary shape fits the enzyme’s active site.
- The enzyme is used up when it binds the substrate.
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