BI-82
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Medium · Effect of temperature and pH on enzymes
The graph shows how the rate of an enzyme‑catalysed reaction changes with temperature. At 37 °C the rate is highest. What happens to the enzyme molecules when the temperature is increased to 70 °C?
- They become inactive but return to normal when cooled.
- They move faster and collide more often with substrate.
- Their active sites change shape and can no longer bind substrate.
- More active sites are produced so the rate keeps increasing.
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