CAIE IGCSE Biology 21.2.4 Use of Biological Washing Powders That Questions

Practise describing enzyme-containing washing powders and planning fair tests of stain removal under controlled conditions.

Exam points

Match amylase, lipase and protease to stain substrates and their digestion products.
Use stain-removal graphs to compare biological and non-biological powders across temperatures.
Explain how high temperatures denature washing enzymes and reduce stain-removal activity.

[Maximum number: 1]

Which enzyme would be used in a biological washing powder?

A

DNA ligase

B

lactase

C

pectinase

D

protease

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