BI-92
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
A scientist measures the rate of an enzyme-catalysed reaction at pH 7. She then repeats the experiment at pH 3, keeping temperature and enzyme concentration the same. The volume of oxygen released per minute decreases. Which statement best explains this result?
- The enzyme is denatured at pH 3 so its active site changes shape.
- The substrate is completely used up at pH 3 so no reaction occurs.
- The enzyme concentration is higher at pH 3 so the reaction slows down.
- The temperature at pH 3 is lower so particles collide less often.
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