BI-1376
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
A scientist measures the rate of an enzyme-catalysed reaction at pH 7 and then at pH 3, keeping temperature and substrate concentration constant. At pH 3, the rate is much lower. What is the most likely reason?
- The enzyme’s active site is altered so the substrate no longer fits
- The substrate is completely used up at pH 3
- The enzyme concentration is higher at pH 7
- The temperature is higher at pH 3
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