Investigating the Respiration of Yeast

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Biology - Coursework

Investigating The Respiration Of Yeast

Factors That Can Affect It

In order to alter the respiration of yeast, I will have to change a factor, this could be any of the following things -

* Temperature

* Amount Of Food (Sugar)

* Amount Of Fluid (Water)

* Different Types Of Yeast

I have decided to investigate the effect of altering the temperature of the experiment.

I predict that the rate of CO2 released will increase with the temperature. The theory behind this is quite complex. Energy is required for respiration (in this case, the transforming of Glucose (C6H12O6) into Carbon Dioxide (CO2)), so there must be a certain amount of energy to start the reaction. Known as 'Activation Energy'. This energy comes from heat energy in atoms, according to particle theory, as the temperature increases, the atoms will vibrate faster. However, adding certain enzymes to the reaction allows the activation energy to be lower. These enzymes require heat energy however to do this.
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In the human body, enzymes will denatureate over a temperature of 460 C, so, therefore, I will not allow the specimens to reach temperatures of above 500 C.

There is no need for an oxygen intake, as this experiment requires Anaerobic Respiration

The Equation For The Experiment Is -

To carry out this experiment I will need: -

* Electronic Scales

* Conical Flask

* Water Bath

* Bunsen Burner

* Tripod

* Heat-Proof Mat

* Tubing (With Bung)

* Measuring Cylinder

* ...

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