BI-199
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
The enzyme sucrase breaks down sucrose into glucose and fructose. According to the lock and key hypothesis, why does sucrase not break down starch?
- Starch does not fit the specific shape of sucrase’s active site
- Starch molecules are too small to collide with sucrase
- Sucrase has no active site when starch is present
- Starch contains no chemical bonds for sucrase to break
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