A researcher designs and experiment to see the effectiveness of an antibiotic on

Question

A researcher designs and experiment to see the effectiveness of an antibiotic on a particular strain of bacteria. She grows bacteria in 30 tubes in liquid culture at 37 degree C with varying doses of antibiotic. She takes samples of those liquids and grows them on plates and counts the number of colonies on each plate. The data table is presented below. (Each colony represents one bacteria from the original culture: so the number of colonies indicate the number of bacteria in the sample). Change in the number of bacterial colonies upon exposure to various doses of an antibiotic. What is the dependent variable in this experiment?____ What is the independent variable?______ Name the standardized variable (s).______ Which tubes were the control treatment in this experiment?_____

Explanation / Answer

Concentration of antibiotic is the dependent variable in the experiment.

Number of colonies of bacteria is independent variable in the experiment.

Antibiotic concentration is the standardized variable in the given experiment.

The tubes with high concentration of antibiotic are the control treatments of the experiment .

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