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CAIE IGCSE Biology 21.2.5 Use of Lactase to Produce Lactose Questions

Practise explaining how lactase breaks down lactose in milk and how immobilised enzyme beads improve the process.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify lactase as the enzyme that breaks down lactose when making lactose-free milk
  • distinguish enzyme hydrolysis from filtering, heating or using lipase to remove lactose
  • explain that immobilised lactase can be reused and kept out of the final milk

CAIE IGCSE Biology 21.2.5 Use of Lactase to Produce Lactose Questions question 1

[Maximum number: 1]

The diagram shows some apparatus that was used to produce lactose-free milk.

Figure for Question CAIE IGCSE Biology 21.2.5 Use of Lactase to Produce Lactose Questions question 1 — CAIE IGCSE Biology

The alginate beads do not react with any of the substances. X is an enzyme that catalyses a reaction involving one of the substances found in milk.

What are X and Y ?

X

Y

amylase

glucose

amylase

starch

lactase

glucose

lactase

starch

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