BI-1282
Lock-and-key model
Biology · Secondary 4 · Medium · Lock-and-key model
In the lock‑and‑key model of enzyme action, why does sucrase only act on sucrose and not on starch?
- Only sucrose has a shape that fits the active site of sucrase.
- Sucrase supplies energy only when sucrose is present.
- Starch molecules are too small to react with sucrase.
- Sucrase changes its active site to fit sucrose but not starch.
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