An investigation was carried out into the effect of increasing time of exposure to UV light on the survival of wild type (WT) and mutant (M) yeast cells - Scottish Highers Biology - Question 12 - 2019
Question 12
An investigation was carried out into the effect of increasing time of exposure to UV light on the survival of wild type (WT) and mutant (M) yeast cells.
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Worked Solution & Example Answer:An investigation was carried out into the effect of increasing time of exposure to UV light on the survival of wild type (WT) and mutant (M) yeast cells - Scottish Highers Biology - Question 12 - 2019
Step 1
State an independent variable in this experiment.
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Answer
The independent variable in this experiment is the time of exposure to UV light.
Step 2
Suggest why exposure to UV light was carried out in a darkened room.
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Answer
Exposure to UV light was carried out in a darkened room to ensure that the yeast cells were only exposed to UV light and to control how much UV light the cells/yeast were exposed to.
Step 3
On the grid, draw a line graph using the results in the table for both WT yeast and M yeast.
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Answer
This step requires drawing a graph, which cannot be provided in text. Ensure that the axes are correctly labeled, points are plotted accurately, and lines connect through all points.
Step 4
Draw one conclusion from the results of this investigation.
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Answer
As the time of exposure increased, the survival of the M and WT yeast decreased, indicating that WT yeast can survive a longer exposure time to UV light than M yeast.
Step 5
Suggest how the investigation could be modified to test the effectiveness of a sunscreen lotion using M yeast as model cells.
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Put a layer of sunscreen/lotion over the plates of M yeast and compare the results with plates that have no sunscreen.
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