Investigate the effect different concentrations of glucose in a yeast & Glucose solution has on the rate of respiration in Yeast.

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GCSE Biology Coursework -

Yeast Respiration

Aim:

To investigate the effect different concentrations of glucose in a yeast & Glucose solution has on the rate of respiration in Yeast.

Introduction:

Respiration is the process of converting glucose to energy, which goes on in every cell. The chemical formula is:

Glucose + Oxygen ---> Energy + Water + Carbon Dioxide

C6H12O + 6O2 --> Energy + 6H2O + 6CO2

Glucose --> Energy + Alcohol + Carbon Dioxide

To measure the rate of respiration I will measure the rate of CO2 produced (a product of respiration) by measuring the volume produced in a certain time.

Variables:

This is an investigation into how the different concentrations of glucose have on respiration in yeast. In this investigation there will be many different factors that could affect the outcome of the experiment. The main one being yeast concentration, this will effect the experiment in the way that the more concentrated the yeast is, the quicker it will react with glucose. Another factor that plays a big part in the outcome of the experiment is the temperature. The temperature has to be right because