CAIE IGCSE Biology 21.2.5 Use of Lactase to Produce Lactose Questions

Practise explaining how lactase breaks down milk lactose and how immobilised enzyme beads can be reused to produce milk for lactose-intolerant consumers.

Exam points

Explain how lactase breaks down milk lactose to make lactose-free milk.
Explain how lactose-free milk benefits people with lactose intolerance.
Explain why immobilised lactase beads can be reused and kept out of the finished milk.

[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 ?

amylase

glucose

amylase

starch

lactase

glucose

lactase

starch

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