Yeast lab. Question: how does the yeast concentration affect the rate of anaerobic respiration?? Measured by the concentration of released CO2.

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Design:

Question: how does the yeast concentration affect the rate of anaerobic respiration?? Measured by the concentration of released CO2.

Main goal (aim): tracking the relationship between the rate of anaerobic respiration and the yeast concentration.

Hypothesis:

Two types of cell respiration exist, aerobic and anaerobic respiration;  anaerobic respiration takes place when there is no enough oxygen for the aerobic respiration, the following equation shows the aerobic respiration:

Glucose   yeast     Ethanol + CO2 + heat.

It is obvious by the previous chemical reaction that as the yeast concentration increases, so does the anaerobic respiration.

Variables:

Independent variable: yeast concentration (a variety of yeast solutions are used, in order to determine the effect of changing yeast concentration on respiration rate).

Dependent variable: CO2 (released amounts), representing the rate of respiration.

Controlled variables:

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Equipments and procedure:

Equipments:

  • PASCO GLX with (CO2 sensor).
  • 200 ml, 3 % sucrose solution.
  • Variety of yeast solutions (g/ml) (2%,4%,6%,8% and 10%).
  • Cylinder.
  • Beaker (200 ml).
  • Plastic cover.

Procedure:

                                                                                

  • Prepare at least 5 different concentrations of yeast (2%, 4%, 6%, 8% and 10%)
  • Solutions were prepared by mixing different percentages of ...

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