Fermentation Using Yeasts

Topics: Carbon dioxide, Cellular respiration, Oxygen Pages: 11 (1773 words) Published: January 21, 2013
*This is a lab report from a previous 181 lab written by a student. It has been modified and cut short a little to convey some important pointers to writing lab reports. The left columns indicate the pointers and some instructions. Please read those carefully. The text material has been provided so that you may have an example of a lab that you have already done. *You should not write the report in table format (this is only for illustration). Also, I expect graphs, tables, and math equations in the result section.

Title: Demonstration of Fermentation using Yeast Cells

|Comments |Text | |Abstract | |Sections of the report are clearly |This experiment is designed to determine if yeast cells undergo fermentation when placed in a closed | |labeled. |flask with no oxygen. Glucose and yeast are mixed together in a closed flask and allowed to incubate for| |No references used in the abstract |about one hour. | |Usually less than 250 words | | | |Then, tests are performed to determine if the products of aerobic and anaerobic respiration are present | |Includes: |in the flasks. The tests detect the presence of carbon dioxide and ethanol. Carbon dioxide should be | |Background information and purpose of the|present irrespective of the type of respiration taking place, but ethanol is present only if | |experiment |fermentation has occurred. Another factor that can indicate whether fermentation occurred or cellular | |Short description of the methods |respiration occurred is the amount of glucose utilized during incubation. | |Results stated | | |Conclusions stated as a short explanation|Fermentation uses more glucose because the process of fermentation is much less efficient than cellular | | |respiration in terms of energy production per molecule of glucose used. The open flask (control) and the| |It includes a summary of the whole lab |closed flask will indicate the difference observed in glucose utilization and if ethanol was produced or| |report with reference to all the |not. | |sections. | | | |The results indicated that yeast cells underwent fermentation when placed in a closed flask. The | |Write the abstract last after writing all|products observed were ethanol and carbon dioxide and these were confirmed using different tests. The | |other sections |amount of glucose was significantly lesser in the post-incubation mixture for the sealed flask where | | |fermentation occurred. The control showed almost similar post-incubation glucose concentrations. In | | |conclusion, the yeast cells in the sealed flask underwent fermentation to produce carbon dioxide and | | |ethanol....
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