Introduction Cellular respiration is a process that all living organisms undergo to produce energy that can be used by each individual cell. It involves a series of enzyme-catalyzed reactions that break down organic molecules to produce chemical energy in the form of adenosine triphosphate (ATP) (Grens et al. 2008). The energy is synthesized in three separate stages in cellular respiration: glycolysis, Krebs cycle, and the electron transport chain. Glycolysis and the Krebs cycle are both anaerobic pathways because they do not need oxygen to form energy, while the electron transport chain does use oxygen in oxidative phosphorylation (Grens et al. 2008). Fermentation is a process adopted, by anaerobic organisms to obtain ATP without the use …show more content…
The exact numerical results being 65+8 and 70 +12 mm of CO2 per hour for Glucose and Fructose compared to only 1+2 mm of CO2 per hour for Galactose. Meanwhile, Disaccharide sugars also showed large differences as Sucrose and Maltose both outproduced Lactose (66+11 and 43+11 mm of CO2 per hour compared to 1+2 mm of CO2 per hour respectively). We observed that Galactose and Lactose sugars produced close to zero carbon dioxide in the fermentation of S. …show more content…
The production of carbon dioxide in Glucose, Fructose, and Sucrose results being very close to each other in their comparison in Figure 1, while Maltose was subject to a small drop off. Standard deviations for all results were high at around +11mm of CO2 produced per hour, however, this deviation was consistent across the board for all sugars except for Galactose and Lactose, which had very low, almost nonexistent readings. This large standard deviation may reflect differences among groups in the yeast-sugar solutions used for their replicate of the experiment. All groups used 16 ml solutions of 8 ml yeast in suspension and 8 ml of the different sugars, but if the solutions were not mixed well together for the setup of the experiment, then groups might have been working with solutions of slightly varied concentrations which may have affected their