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Cambridge IGCSE Biology practice

Paper 4 structured question: Biotechnology

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4

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1

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Topic

Biotechnology

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Paper 4Theory (Extended)1 marks

Some people cannot digest lactose because they lack enough lactase enzyme. Lactose-free milk is made by using lactase to break down lactose in milk.

Description

Lactose-Free Milk Production

Lactase enzyme is used to convert lactose in milk into glucose and galactose, producing lactose-free milk that is easier to digest for lactose-intolerant individuals.

  1. a

    State the sugars produced when lactase breaks down lactose.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 4 structured question: Biotechnology

Paper 4Theory (Extended)3 marks

Description

Lactase and Lactose-Free Milk

Lactase is an enzyme that breaks down lactose in milk into glucose and galactose. This process produces lactose-free milk, which is suitable for people who are lactose intolerant.

  1. a

    Explain how lactase is used to create lactose-free milk.

    Aim for approximately 3 distinct marking points.

    [3]