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Willliam Matcham




Biology 3 ­ Microorganisms
Food and drink from Microorganisms
Microorganisms such as bacteria cause changes in food. Often these changes can be bad, but sometimes
we can use them to our advantage. Microorganisms such as yeast are used as part of the production of
some foods, including cheese…

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Willliam Matcham




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Willliam Matcham




Most Cheese is made using Bacteria:

1. A culture of bacteria is added to milk.
2. The bacteria produce solid curds in the milk.
3. The curds are separated from the liquid whey.
4. More bacteria can be added here to the curds.
5. The lot is left…

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Willliam Matcham




5. The sugary solution is fermented by yeast, turning the sugar into alcohol.

In wines, the yeast uses the natural sugar in grape juice as the energy source.




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