BI-1403
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
A graph of enzyme activity against temperature shows that the rate increases from 10 °C to 35 °C, then decreases sharply from 40 °C to 70 °C.
Which statement best explains why the rate decreases at temperatures above 40 °C?
Which statement best explains why the rate decreases at temperatures above 40 °C?
- The enzyme is denatured and its active site no longer fits the substrate.
- The enzyme molecules freeze and cannot move at high temperatures.
- The substrate concentration becomes zero at high temperatures.
- The enzyme is used up faster than it is formed at high temperatures.
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