An investigation was carried out into the effect of UV radiation exposure time on the survival of yeast cell colonies - Scottish Highers Human Biology - Question 3 - 2022
Question 3
An investigation was carried out into the effect of UV radiation exposure time on the survival of yeast cell colonies.
20 cm³ of a concentrated yeast cell suspensio... show full transcript
Worked Solution & Example Answer:An investigation was carried out into the effect of UV radiation exposure time on the survival of yeast cell colonies - Scottish Highers Human Biology - Question 3 - 2022
Step 1
State two variables, other than those described above, that would need to be controlled when setting up this investigation.
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Answer
Volume/thickness/area/mass/weight/concentration/pH/type of nutrient gel.
Size/diameter of dish/dishes or lid thickness of dish.
Step 2
Suggest why the concentrated yeast cell suspension was diluted with water before it was added to the dishes.
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Answer
To prevent too many cells/colonies growing (in the dishes) so that they can access space/nutrients/resources.
Step 3
Draw a line graph to show the data in the table.
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Answer
In a line graph:
Label the horizontal axis as 'Length of UV exposure time (min)'.
Label the vertical axis as 'Number of yeast cell colonies'.
Plot the points for the data provided and connect them with straight lines.
Step 4
State the conclusion that can be drawn from these results.
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Answer
As the length of UV exposure time increases, the number of yeast cells/colonies generally decreases.
Step 5
Predict the number of yeast cell colonies that would be present if the exposure time was 11 minutes.
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Extrapolating from the data, it is likely that the number of yeast cell colonies would be less than 30, possibly around 20.
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