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Yeast Respiration Lab Report

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Title What is the effect of different sugar substitutes on cellular respiration in yeast? Purpose The purpose of this experiment is to test whether sugar substitutes can be used to effectively promote cellular respiration of yeast. Background Yeast is used to bake different food items. To bake, yeast needs to reproduce using sugar. The yeast metabolises the sugar for energy to be able to reproduce. Because yeast is a fungus, yeast can have both sexual and asexual reproduction. This means that yeast can be a haploid and a diploid cell. When referring to asexual reproduction, the term is known as fission. When yeast reproduce, they can reproduce with or without oxygen. When oxygen is present, more energy can be taken from the sugar molecules. …show more content…

Amount of CO2 Produced; All 4 sugars reached CO2 production of 10,000, ie. the upper CO2 detection limit of the sensor. Since all 4 sugars reached the 10,000 mark and had not leveled off by then, the experiment did not allow a conclusion to which sugar produces less or more CO2. B. Speed of CO2 Production The average time to reach the 10,000 ppm for CO2 production from the 5 experiments for the table sugar was 191.2 seconds, for Sweet N’Low 171.2, Equal 178.4, and Stevia Extract 175.2. There was discrepancy in the 5 trails which sugar met the 10,000 ppm first, once it was the Stevia Extract, twice Sweet’N Low, once the table sugar, and once the Equal. Conclusion The hypothesis could not be proven by the way this experiment was set up. The experiment does not allow a conclusion as to which sugar produces the most CO2 emission because the settings of the sensor were such that it maxed out at 10,000. In a follow up experiment, the high settings of the sensor would be used to be able to measure at what CO2 ppm the curve for each sugar would level out. This would allow a distinction which of the sugars produced the most or the least CO2 emission, ie the most or least yeast

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