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CAIE IGCSE Biology 21.2 Biotechnology Question Bank

Practise biotechnology questions by applying yeast respiration, enzyme uses and fermenter conditions to bread, biofuel, fruit juice, milk and medicines.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • link yeast anaerobic respiration to ethanol biofuel and carbon dioxide in bread-making
  • apply pectinase and washing-powder enzymes to fruit juice yield and stain removal
  • use lactase and fermenter controls for lactose-free milk, penicillin and mycoprotein

Covered syllabus points

21.2.1—Role of anaerobic respiration in yeast21.2.2—Role of anaerobic respiration in yeast21.2.3—Use of pectinase in fruit juice21.2.4—Use of biological washing powders that21.2.5—Use of lactase to produce lactose-21.2.6—Fermenters can be used21.2.7—Conditions that need to be controlled

21.2 Biotechnology question 1

[Maximum number: 2]

Some countries have invested in biofuels such as ethanol, biomass and biodiesel.

Describe how ethanol can be made by microorganisms.

21.2 Biotechnology question 2

[Maximum number: 1]

State one food product that is made using anaerobic respiration in yeast.

21.2 Biotechnology question 3

[Maximum number: 1]

Apples are used to make apple juice.

State one enzyme used in fruit juice production.

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