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Biology B3 biotechnology (EDEXCEL) revision
Important processes
Production of Yoghurt

1. Milk is pasteurised to kill any pathogens and cooled to 450C
2. A culture of Lactobacillus Bulgaricus is added to the warm milk
3. The bacteria break down the lactose sugar in the milk into lactic acid
4. The…

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Microorganism Use
Acetobacter Used in the production of Vitamin C
Saccharomyces Ceravisiae ­ a type of yeast Produces the enzyme invertase which converts
sucrose into glucose and fructose to produce
the semi-liquid centre in some chocolate eggs
Aspergillus Niger To Produce Citric acid which is used as a
flavouring and…

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o Plant Stanol Esters can lower cholesterol. High levels of cholesterol can lead to heart
o Prebiotics are foods containing Oligosaccharides. They are not easily digested by the
human gut and provide food for `friendly bacteria'

Stem cells and biotechnology ethics
Stem cells

Stem cells are undifferentiated cells with…


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