Yeast can produce energy from sugar by the aerobic

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Yeast can produce energy from sugar by the aerobic respiration or fermentation process. In aerobic respiration oxygen must be present. The chemical formula for this is . When there is no
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oxygen available (anaerobic conditions) yeast can use the process of fermentation. This process still uses sugar but because there is no oxygen the chemical formula is changed to . Both formulas have similarities as both produce ATP and (Manning, 2001). Because yeasts require organic compounds for energy they are considered chemoorganotrophs, which are different than plants which require light for energy. The main food source for yeast is sugar usually glucose or disaccharides like sucrose and maltose. Within the yeast community there are few species that are able of metabolizing fructose, alcohols, and organic acids. The life cycle of yeast depends on the process of growth and survival. There are two methods to this cycle; haploid and diploid. Both the haploid and diploid yeast cells divide by budding (Manning, 2001). Conclusion The original hypothesis for this lab was accurate in that the sugar solution combined with the yeast was the most active of all four solutions. This lab did not introduce any problems or errors throughout the process. A key aspect to this experiment was keeping accurate records, when evaluating multiple populations this can become a challenge. By doing so this allowed the hypothesis to be recorded as accurate and the observation of the population to be determined as true when the population increased between day 2 and 3 and then declined on day 4 drastically. A future lab experiment involving yeast and the release of oxygen could provide a measurement of the biogeochemical cycle. In this experiment two sets of solution would be used, one without oxygen for fermentation results and one with for aerobic respiration.
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References Manning, T. (July 2001). Yeast Experiments. Kennesaw State university. Retrieved from Smith, T. M., & Smith, R. L. (2009). Elements of ecology (7th ed.).San Francisco, CA: Benjamin Cummings/Pearson. UOP (2013). Yeast Lab Spreadsheet BIO/315 Version 2. Retrieved from University of Phoenix UOP (2013). Yeast Lab Worksheet BIO/315 Version 2. Retrieved from University of Phoenix UOP (2013). Lab Report Outline BIO/315 Version 2. Retrieved from University of Phoenix
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