A reaction is catalysed by an enzyme from the human body. The rate at 20 °C is lower than at 37 °C, and the rate at 60 °C is also lower than at 37 °C.
Explain why the rate is lower at 20 °C than at 37 °C, and why it is lower at 60 °C than at 37 °C.
78 exam-style questions on Edexcel GCSE Biology 7.3 Homeostasis and thermoregulation, covering 7.3.1 Importance of a constant internal environment, 7.3.2 Importance of homeostasis, 7.3.3a Thermoregulation via the skin and hypothalamus, and 7.3.3b Vasoconstriction and vasodilation in thermoregulation. Each one has a worked solution and a mark scheme showing where the marks go.