IntroductionThe purpose of this investigation is to test the effects of several sugary substances on yeast respiration. Most people think of yeast when they think of what makes bread, cheese, alcoholic beverages, or other food products rise. Another type of yeast can also cause yeast infections, a skin infection. Yeasts (Saccharomyces) are tiny microscopic organisms with a thin membrane and are usually oval or circular in shape. It is a type of unicellular fungus of the Ascomycetes class, capable of transforming sugar into alcohol and carbon dioxide (CO2); this process is known as fermentation. Fermentation and products are the main points of interest in this experiment, since cellular respiration of yeast occurs via the fermentation process, which creates byproducts of alcohol and CO2. The level of CO2 produced by the yeasts will show the effectiveness of each sugary substance in providing cellular energy to the yeasts. The name of the fermentation process comes from “fervere,” the Latin word meaning “to boil.” Early observers of the process gave it this name because when fermentation occurred in barrels containing crushed grapes, used to create wine, bubbles would occur, making the mixture appear to be boiling. Yeasts have been secretly creating alcoholic (fermented) beverages since ancient times in Asia, Egypt, Babylon and many other ancient civilizations. However, no one knew what made the process work and what made the creation of such fermented drinks possible. When we think of traditional winemakers, it's not uncommon to imagine someone standing in a large bucket crushing grapes with their feet. These former winemakers realized that for some strange reason... middle of paper... "Honey vs. Sugar - Which is Healthier?" Go ask Alice! Columbia Health, May 18, 1995. Web. April 29, 2014. “Nutrition and healthy eating. » Artificial sweeteners and other sugar substitutes. Mayo Clinic, October 9, 2012. Web. April 29, 2014. Reinke, Beth Bence. “How sweet: sorting the sweeteners.” CBN. The Christian Broadcast Network, 2014. Web. April 29, 2014. Singh, R. Paul. “Sugar (chemical compound).” Encyclopedia Britannica Online. Encyclopedia Britannica, 2014. Web. April 29, 2014. “Yeast.” How things work. HowStuffWorks.com, October 15, 2008. Web. April 28, 2014.Zamora, Antonio. “Carbohydrates – Chemical Structure.” Scientific psychology. NP, 2014. Web. April 29, 2014.Zamora, Antonio. “Chemical Structure of Sugar Substitutes and Artificial Sweeteners.” Chemical structure of sugar substitutes and artificial sweeteners. Scientific Psychic, 2014. Web. April 29. 2014.