BI-67
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
The graph of an enzyme reaction shows that the rate increases as temperature rises from 10°C to 37°C, then decreases sharply at higher temperatures. Which statement explains the decrease above 37°C?
- Substrate molecules stop moving.
- The enzyme becomes denatured and its active site changes shape.
- The enzyme is frozen and cannot bind substrate.
- More enzyme-substrate complexes are formed.
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