BI-38
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
An enzyme works fastest at 37 °C. The rate decreases slowly at 20 °C and drops to almost zero at 70 °C. Which statement best explains the very low rate at 70 °C?
- The enzyme is denatured and its active site changes shape
- The enzyme freezes and cannot move
- The substrate is completely used up at 70 °C
- The enzyme concentration becomes zero at 70 °C
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