MICROORGANISMS BREATHE

1. Like all living things, microorganisms undergo life processes.

2.Yeast is a type of fungus.

dried yeast

• Yeast looks like little round blobs under a microscope.
• Individuals are too tiny to be seen but a large cluster of them look like a white or yellow powdery substance.

3. When yeast breathes, it takes in oxygen and gives out carbon dioxide.

4. This process causes dough to rise. The air spaces in bread are the result of carbon dioxide given off when yeast acts on dough.

5. This characteristic makes yeast very important to the brewing and food making industries.