Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
covert the procedure to passive voice and past tense
Transcribed Image Text:Effectiveness of sunscreens against UV radiation on Bacterial growth
Procedure
1. Following 24-48 hours growth, determine the number of bacterial colonies growing
on your Petri dishes.
2. The number of colonies represents the bacteria that survived the UV light and reflects
the amount of protection the sunscreen offered.
3. Accurately do a colony count on the control sides of the two Petri dishes for your first
sunscreen. These numbers represent your raw data.
4. Add these numbers together and divide by two. This number represents your
averaged data for that control.
5. Repeat the colony count on the two plates containing the second sunscreen tested.
6. Add these numbers together and divide by two to obtain an average.
7. Now perform colony counts on the experimental sides of the two plates for your two
experimental groups. Record the raw data and average for each group.
8. Complete Data Table 1
9. Make a bar graph comparing the percent survival of your two experimental groups.
10. Calculate the % survival for each experimental group:
Percent survival Average colony count with sunscreen (experimental)
Average colony count with aluminum foil (control)
11. Dispose of bacteria plates properly.
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