BI-18
Effect of temperature and pH on enzymes
Biology · Secondary 3 · Hard · Effect of temperature and pH on enzymes
Pepsin is a protease that works in the stomach. At 37 °C it breaks down 40 g of protein in 10 minutes. At 10 °C, it breaks down only 10 g of protein in the same time. Which statement best explains this difference?
- At 10 °C, pepsin is denatured and cannot bind to protein.
- At 10 °C, fewer successful collisions occur between pepsin and protein molecules.
- At 37 °C, the active site of pepsin is destroyed so it works faster.
- At 37 °C, there are fewer enzyme–substrate complexes formed each second.
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