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Cambridge IGCSE Biology practice

Paper 3 structured question: Biotechnology

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Attempt questionBiotechnology revisionRevise the key idea

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Biotechnology

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Paper 3Theory (Core)3 marks

Yeast cells can respire anaerobically to produce ethanol, which is used in biofuels.

Description

Anaerobic Respiration in Yeast

Yeast cells break down glucose without oxygen to produce ethanol and carbon dioxide. This process releases energy for the yeast and produces ethanol that can be used as a biofuel.

  1. a

    Describe how anaerobic respiration in yeast leads to the production of ethanol used in biofuels.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 3 structured question: Biotechnology

Paper 3Theory (Core)2 marks

Description

Ethanol Production by Yeast

In the absence of oxygen, yeast cells convert glucose into ethanol and carbon dioxide. This ethanol is important as a renewable energy source.

  1. a

    Identify the two main products of anaerobic respiration in yeast.

    Aim for approximately 2 distinct marking points.

    [2]