Wales GCSE Integrated Science Practice Questions - Made-for-Wales GCSE Integrated Science (Single Award) (WJEC) Exam

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A learner investigates how temperature affects catalase activity by measuring oxygen volume produced from hydrogen peroxide. At 80 °C the volume is much lower than at 37 °C. What is the best explanation?

The enzyme was denatured so the active site shape changed The substrate concentration increased at 80 °C Oxygen gas cannot exist above 37 °C All collisions stopped completely at 80 °C

Correct Answer:

The enzyme was denatured so the active site shape changed

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