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Marlene Soares Bridging Science L2 Group2 15/03/2007 1.2 Identify respiration in yeast. Glucose solution Number of bubbles released per minute Average bubble production 1 2 3 4 1% 3 4 3 2 3 5% 7 5 5 5 5.5 10% 6 5 5 6 5.5 Conclusion- Glucose concentration increases and the number of bubble produced increases. Explanation- Glucose is used in respiration to produce carbon dioxide, water and energy. The yeast becomes more active as energy production due to respiration increases. Questions 1- What gas is likely to be present in the bubbles? The gas that is present is carbon dioxide. 2- How would you collect and test the gas to find out if your answer is correct? I will collect the gas with a test tube and then light on; if it will come with a pump sound then I know that carbon dioxide is present. 3- What process is being performed by yeast cells which uses up glucose and produces a gas? Chemical reaction on yeast by respiration and growth. 4- Does the strength of the glucose solution affect the rate of gas production? If so, how? The...

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