# Describe how yeast is used in bread-making and explain how the process causes dough to rise.

> Cambridge International IGCSE Biology (0610) — 21.2 Biotechnology · Describe · 4 marks

## Mark scheme (4 marks)

1. Yeast respires anaerobically (in the dough)
2. Glucose is broken down / used as a substrate by yeast
3. Carbon dioxide is produced / released
4. Bubbles of carbon dioxide form inside the dough, causing it to rise

## Key terms

- [yeast](https://www.gradenine.co.uk/glossary/yeast)

## Related

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Source: [GradeNine](https://www.gradenine.co.uk/q/describe-how-yeast-is-used-in-dbbcf05c) · Published by Druglandscape Ltd.