BI-1380
Effect of temperature and pH on enzymes
Biology · Secondary 4 · Hard · Effect of temperature and pH on enzymes
In an experiment, a student measures the rate of an enzyme-catalysed reaction at different temperatures. The rate increases from 15 °C to 35 °C, but then decreases sharply at 50 °C. Which statement best explains the decrease in rate at 50 °C?
- The enzyme is denatured so its active site changes shape and fewer substrates can bind.
- The substrate is used up completely so there are no more collisions with the enzyme.
- The enzyme molecules move too slowly to collide with the substrate at 50 °C.
- The pH of the solution always decreases when temperature reaches 50 °C.
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