... of fermentation, producing carbon dioxide (a gas) and ethanol. The rates of the chemical reactions of fermentation depend on the action of enzymes. The enzymes present in yeast cells are specific and will only catalyse the fermentation of certain sugars and not others. Yeast fermentation gives the following during reaction: C6H12O6-------> 2CH3CH2OH + 2CO2 + energy Enzymes Glucose ---------------> carbon dioxide + ethanol + energy (ATP) (a gas) Material: 1. 5 - fermentation tubes, labeled 1 through five. 2. 5 large test-tubs 3. constant-temperature water bath (37oC) 4. pipettes 5. mm ruler 6. 20% solution of each: dextrose, fructose, sucrose, maltose 7. distilled water 8. 10% baker's yeast suspension Procedure: 1. Five fermentation tubes were labeled upside down near the bottom. 2. To each test tube 2 ml of water is added and 2ml of each of the sugar solution in different test tubes, to each tube 2ml of yeast suspension and then the tubes were brought up with water. 3. Each fermentation tube ...

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