... respiration not to take place. However if the temperature is less than around 30ºC it shall mean that the enzymes work slower and therefore the reactions will be slower and the energy produced by respiration shall decrease. Preliminary investigation In the first incidence I decided that I would fill a beaker full of 200 cm³ of water from the kettle. The temperature of the water was 70ºC. I noticed at this temperature nothing happened and I then came to the conclusion that the enzymes in the yeast cell had denatured. I then poured purely tap water at a temperature of 18ºC into the 200cm³ beaker. In this case there was no change in the yeast even though I left it for 10 minutes. After this I then came to the conclusion that I should only stay a few degrees below 37ºC and a few degrees above it. I did this but ...

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