BI-178
Lock-and-key model
Biology · Secondary 3 · Medium · Lock-and-key model
In an experiment, an enzyme works fastest at 37 °C. When heated to 75 °C, the enzyme no longer functions even after cooling back to 37 °C. What is the best explanation?
- The enzyme is denatured and its active site is permanently changed.
- The enzyme is used up and cannot be replaced.
- The substrate has been completely used up.
- The enzyme has become dormant and needs more heat to reactivate.
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