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Yeast Growth Simulation One of the most critical factors for the brewer is temperature. Planning the investigation requires a series of decisions about manipulating and controlling variables, a suitable duration for the investigation and how and when yeast growth should be monitored. Manipulating variables: What would be a suitable range of temperatures to choose? We know that all organisms exhibit the same seven characteristics. The effect of temperature on the metabolism of most living things is similar because these chemical reactions are all dependent on enzymes. A suitable range of temperatures is from 0-50?C. Most organisms cannot tolerate a temperature above this. Controlling variables: Which variables need to be controlled - i.e. kept constant - to make this a fair test? * yeast concentration - an initial concentration of 10 g dm-3 is suitable * sugar concentration - in a brewery fermentation, the concentration of sugars is usually about 65-70 g dm-3 * oxygen concentration - in a brewery fermentation,...

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