Marlene Soares
Bridging Science L2
Group2
5/03/2007
.2 Identify respiration in yeast.
Glucose solution
Number of bubbles released per minute
Average bubble production
2
3
4
%
3
4
3
2
3
5%
7
5
5
5
5.5
0%
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
- 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?
Bridging Science L2
Group2
5/03/2007
.2 Identify respiration in yeast.
Glucose solution
Number of bubbles released per minute
Average bubble production
2
3
4
%
3
4
3
2
3
5%
7
5
5
5
5.5
0%
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
- 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?