The ‘Pasteur Effect’ - Case Study - Science Assignment Help

Assignment Task:

Task:

Exercise 5.1. Preparation of yeast cultures

You will be provided with a yeast suspension that has been prepared by the technical staff as follows:
Baker’s yeast was washed three times in 0.66 M KH2PO4, pH 4.8, and made up to a 1 % wet weight suspension. Glucose (11 mL, 0.25 M) was added to 100 mL of this yeast suspension and mixed well. Immediately after mixing, a sample of this yeast suspension was removedand centrifuged, and the supernatant stored on ice as the “time = 0” sample for both the glucose and ethanol assays.
Once you have collected your yeast suspension, you will perform the following:
1. Pipette 4 mL of the yeast suspension with glucose into each of two 50 mL Erlenmeyer flasks which have been placed in an ice bath. One flask should be labelled with ‘O2’ and the other flask ‘N2’.

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