BI-134
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
A graph shows the rate of an enzyme‑catalysed reaction at different temperatures. The rate is highest at 37 C and falls to zero at 70 C. Which statement best explains the low rate at 70 C?
- The enzyme is denatured and its active site no longer fits the substrate.
- The enzyme molecules have no kinetic energy at this temperature.
- The substrate is converted into enzyme at this temperature.
- The enzyme concentration becomes zero at this temperature.
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