BI-1305
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
A student measures the rate of an enzyme-catalysed reaction at pH 7. She then repeats the experiment at pH 3 and finds the rate is much lower. Which statement best explains this result?
- Low pH always increases the kinetic energy of substrate molecules.
- The enzyme is denatured and its active site no longer fits the substrate.
- The substrate is converted back into its original form at low pH.
- The enzyme concentration becomes higher at pH 3.
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