Investigating The Effect Of Temperature On The Respiration Of Yeast

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Grant Yim


Investigating The Effect Of Temperature On The Rate Of Respiration Of Yeast

Table showing the effects of temperature on the rate of respiration of yeast


        To conclude, it can be identified from the results that as temperature increases, the rate of respiration of yeast also increases.  The rate of which respiration increases doubles with every 10°C increase in the temperature, the theory which identifies this trend is called Q2. Examples of this trend can be seen with an increase in temperature from 10°C to 20°C; which resulted in an increase in the average rate of reaction from 0.039 to 0.067, that is an 75.67% increase in the rate of reaction. The same applies from 20°C to 30°C and from 30°C to 40°C, with 65.3% and 101% increases in rate of respiration respectively. This increased in rate of respiration is due to the increased kinetic energy within the glucose-yeast solution. With more kinetic energy in the molecules, cellular reactions are carried out with more successful collisions (molecules joining with the enzyme’s active site) at a more frequent rate, which increases the rate of reaction, increasing the rate of respiration. This is also reflected by the positive gradient of the graph.

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However when the temperature increases from 40°C to 50°C, Q2 no longer applies which is reflected in the results. Showing the average rate of respiration increase from 0.210 to 0.239, this is due to the denaturing of the enzymes in the yeast signifying cellular rate of respiration decreasing. The enzyme’s optimum temperature is at 37°C, and starts denaturing at around 42°C; yeast contains enzymes which are required to carry out anaerobic respiration. When the temperatures reaches around 40°C, the active enzyme cell deforms and the hydrogen bonds break due to the increased kinetic energy, denaturing the yeast enzyme meaning ...

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