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How Does Temperature Affect the Rate of Respiration of Yeast?
- Essay length: 1980 words
- Submitted: 11/07/2002
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Marked by teacher:
Cornelia Bruce
Teacher essay summary
This laboratory investigation into the effect of temperature on respiration begins well with a thorough and well researched introduction. It provides a solid foundation for the investigation however more care does need to be taken to reference information more appropriately. The main section of the report is too brief and does miss key elements essential to any good laboratory report including a labelled method diagram and graphs of the experimental results. More care also needs to be taken when evaluating the results simply stating that the results supported the prediction is insufficient, more links need to be made between the result and the science behind respiration.
Marked by teacher Cornelia Bruce 09/04/2013
The first 200 words of this essay...
How does temperature affect the rate of respiration of yeast?
Introduction
Respiration usually happens in the presence of air (oxygen), this is called aerobic respiration. However respiration can also happen without oxygen and this is called anaerobic respiration.
Yeast contains single-celled organisms which respire aerobically if oxygen is available. When the yeast is mixed with sugar or glucose solution, it soon starts to respire. The yeast uses sugar and oxygen dissolved in the water to produce carbon dioxide, water and energy by aerobic respiration. This is the chemical equation for aerobic respiration.
Yeast
Glucose + oxygen -----------------> carbon dioxide + water + energy
C6H12O6 6O2 6CO 2 6H2O 2880 kJ / mole
When all the oxygen has been used up, the yeast continues to respire anaerobically. Under anaerobic conditions, the yeast produces carbon dioxide and ethanol (alcohol) rather than carbon dioxide and water. This is the chemical equation for anaerobic respiration.
Yeast
Glucose -----------------> ethanol + carbon dioxide + energy
C6H12O6 2C2H5OH 2CO2 210 kJ / mole
We call this process alcoholic fermentation. As with aerobic respiration, this reaction does not take place
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MbT essay summary
This laboratory investigation into the effect of temperature on respiration begins well with a thorough and well researched introduction. It provides a solid foundation for the investigation however more care does need to be taken to reference information more appropriately. The main section of the report is too brief and does miss key elements essential to any good laboratory report including a labelled method diagram and graphs of the experimental results. More care also needs to be taken when evaluating the results simply stating that the results supported the prediction is insufficient, more links need to be made between the result and the science behind respiration.
