Biological washing powders contain enzymes, including lipase and protease.
The instructions on a packet of biological washing powder say that the powder works well at 40 ∘C40\ ^{\circ}\text{C}40 ∘C but should not be used at 90 ∘C90\ ^{\circ}\text{C}90 ∘C.
Explain why the washing powder does not remove stains at 90 ∘C90\ ^{\circ}\text{C}90 ∘C.
Explain how lipase helps to remove greasy stains from clothes.
A student wrote:
"The enzymes in the washing powder are killed at high temperatures."
Explain why the student is wrong.
44 exam-style questions on Edexcel GCSE Biology 1.3 Enzymes, covering 1.3.1 Mechanism of enzyme action, 1.3.2 Denaturation of enzymes, 1.3.3 Factors affecting enzyme activity, and 1.3.4 Measuring energy in food by calorimetry. Each one has a worked solution and a mark scheme showing where the marks go.