BI-119
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
In an experiment, the rate of enzyme action increases as temperature rises from 10 °C to 35 °C, but decreases sharply from 40 °C to 60 °C. Which statement best explains the decrease above 40 °C?
- Substrate molecules stop moving at higher temperatures.
- The enzyme becomes denatured and its active site changes shape.
- The enzyme is used up and no longer present in the solution.
- The activation energy of the reaction becomes zero.
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