Biology, 08.09.2020 22:01 DangeRz

Julie sees commercials for antibacterial products that claim to kill almost all the bacteria in the area that has been treated with the product. Julie asks, “How effective is antibacterial cleaner in preventing the growth of
bacteria?” She sets up an experiment in order to study the effectiveness of antibacterial products. Julie
hypothesizes that the antibacterial soap will prevent bacterial growth. In her experiment, she follows the
following procedure.
a. Obtain two Petri dishes with nutrient agar.
b. Rub a cotton swab along the surface of a desk at school. Then, carefully rub the nutrient agar with the
cotton swab without breaking the gel.
c. Repeat the same process with the other Petri dish.
d. Spray one of the Petri dishes with an antibacterial kitchen spray.
e. Carefully tape shut both of the Petri dishes and place them in an incubator.
f. Check the Petri dishes and record the results once a day for one week.
Identify the experimental variable and three control variables in the experiment.

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Julie sees commercials for antibacterial products that claim to kill almost all the bacteria in the...