Index Cellular respiration in yeastPurposeHypothesisAnalysis questionsConclusionCellular respiration in yeastPurposeThe purpose of this experiment was to teach students about the effects that different variables have on cellular respiration and also to give students the opportunity to design their own experiment. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Hypothesis If the sugar concentration in the water increases, the yeast will have a faster respiration rate and therefore produce more carbon dioxide. Procedure1 . Label three test tubes A, B and C.2. Place 0.5 teaspoon of sugar in test tube A.3. Place 0.75 teaspoon of sugar in test tube B.4. Place 1 teaspoon of sugar in test tube C.5. Add 2ml of water to each test tube and shake gently until the sugar is completely dissolved.6. Place 0.5 teaspoon of yeast in each test tube.7. Place a balloon over each test tube and immediately begin timing.8. Every four minutes, measure the circumference of each balloon and record the measurement.a. If the balloon cannot stand on its own, do not measure the circumference.9. Continue measuring the balloons until five intervals have passed. Analysis Questions1. What do you think would happen to the rate of reaction if you increased the temperature of the water?a. I think the reaction speed would be faster, because when baking with yeast, the instructions always say to allow the yeast to activate in warm water.b. Are there other factors that could alter the rate? Some other factors that could alter the rate of the reaction are the pH level, the age of the yeast, the quality of the sugar, and the surface area of ​​the yeast cluster.2. What would happen in the experiment if the yeast used lactic acid fermentation instead of alcoholic fermentation?a. If the yeast used lactic acid fermentation instead of alcoholic fermentation, none of the balloons would fill because lactic acid fermentation does not produce carbon dioxide.3. Were there sources of error in your experiment?a. Our main source of error was that we had not completely dissolved the sugar in the water in test tubes B and C, which meant that the sugar mostly sank to the bottom of the test tube and the water remained on top of the sugar.b. How would they affect the outcome of your experiment?i. Because the yeast floats in water, after adding it to the test tubes and shaking them, the yeast was still separated from the sugar by the water in test tubes B and C and therefore could not perform alcoholic fermentation very well. Test tube A was the only test tube in which the yeast produced a significant amount of carbon dioxide, meaning we didn't have enough data to find a trend between different sugar concentrations. Please note: this is just a sample. Request a custom test tube article now from our expert writers. Get a Custom Essay Conclusion The main idea of ​​this experiment was to see if the respiration rate of yeast was affected by the amount of sugar available. We failed to find a trend due to inconclusive results, due to a laboratory error. Test tube A produced enough carbon dioxide to fill a balloon up to 5 cm in diameter, but the other two test tubes did not produce a measurable amount of carbon dioxide. Therefore, our reports can neither support nor refute our hypothesis because there is no trend in our results.