BI-1286
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
The rate of an enzyme‑catalysed reaction is measured at different temperatures. It increases from 20 °C to 40 °C, but decreases sharply at 70 °C. Which explanation is correct?
- At 70 °C the enzyme is denatured and its active site changes shape.
- At 70 °C there are no collisions between enzyme and substrate.
- At 40 °C the enzyme is denatured but still works faster.
- At 20 °C the enzyme is denatured and cannot bind substrate.
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