How Does a Temperature Affect the Rate of Yeast Respiration

7945 Words Mar 9th, 2013 32 Pages
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The Effect of Temperature on the Respiration of Yeast
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This process does not require oxygen and is referred to as fermentation.
This process partially breaks down carbohydrates and it obtains a small amount of energy, again in the form of ATP. Pyruvic acid has to be broken down in respiration when formed by breaking down of glucose molecules, this can't be done in the same way as in aerobic respiration. When anaerobic respiration is taking place carbon dioxide and ethanol is formed. The reaction for this process is:

C6H12 O6 → 2C2H5 OH + 2CO2 + ATP

This process also uses the glycolysis stage of respiration, however it can not use the Krebs cycle or electron transport as oxygen is required. Therefore without oxygen it allows cells to make small amounts of ATP. Yeast will aim to respire aerobically, as higher yields of ATP can be acquired, however in certain environments it is able to respire anaerobically.

Like most other living organisms, yeast metabolic activity is controlled by enzyme activity. Yeast, after activation creates carbon dioxide and ethyl alcohol by secreting the enzyme zymase, which is a complex of 12 enzymes, in the yeast which acts on simple sugars such as glucose.

Enzymes are biological catalysts; they are designed to help speed up the rate of many reactions without actually taking part in the reaction themselves, therefore being reusable. For enzymes to be useful in a reaction, the substrate needs to bind with the enzymes active site. The active site is specific for a
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