BI-113
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
In an experiment, the rate of an enzyme-catalysed reaction increases as temperature rises from 10 °C to 37 °C, but decreases sharply when the temperature is raised further to 60 °C. Which statement best explains the decrease in rate above 37 °C?
- The enzyme becomes denatured and its active site changes shape.
- The substrate molecules stop moving and cannot collide with the enzyme.
- The pH of the solution always decreases at higher temperatures.
- The enzyme concentration becomes zero at temperatures above 37 °C.
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