Explain the role of personal hygiene in the control of microbial disease.

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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?
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The concentration present include the enzymes that control the process of respiration since this will affect the speed of chemical reaction, the rate of respiration and the rate of growth, there will be more respiration and more carbon dioxide produced as bubbles.

5- How would you modify and control the above experiment to find out if temperature affects the rate of gas production?

I will change the glucose solution by different temperatures.

.3 Identify the factors that affect the growth of yeast.

Temperature

Number of bubbles released per minute

Average bubble production
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