Yeast Respiration Lab Report

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What is the Effect of Sugar on Yeast Respiration? Pre Lab: 1. Yeast is an organism that breaks down molecules like sugar to create energy. It also gives off carbon dioxide as a by-product. This lab observed the relationship between the amount of sugar fed to yeast and the amount of inflation of a balloon attached to the test tube caused by carbon dioxide released as a by-product. 2. In the lab, equal amounts of warm water (⅘ the volume of the test tube) and equal amounts of yeast (2 grams) were placed in three different test tubes. A balloon was placed on each of the test tubes to catch the carbon dioxide that was released. The tubes were observed every two minutes for twenty minutes to check the changes in the balloon diameter and any change within the tubes. 3. The more carbon dioxide that was released caused the balloons to inflate making the diameter larger. This showed how the different amounts of sugar affected the carbon dioxide production of yeast. 4. Independent variable (IV), dependent variable (DV), controlled variables (CV): IV- time of experiment IV- amount of sugar DV- diameter of balloon CV- brand of test tubes CV- location of testing CV- day of testing CV- amount of warm water CV- amount of yeast CV- type of yeast CV- type of sugar 5. The control …show more content…

The control tube did not have sugar, and it did not produce any carbon dioxide or enough to inflate the balloon at all. On the other hand, the tubes with sugar did inflate the balloons. The lab did not support my hypothesis. I claimed that the tube with the most sugar would produce the most carbon dioxide. The tube with the most carbon dioxide produced was actually tube three with 2 grams of sugar. Test tube two had 3 grams of sugar and ended the twenty minutes with its balloon diameter of 13.5 centimeters. On the other hand, test tube three finished with a balloon diameter of 17

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