OAE Biology Practice Questions - Ohio Assessments For Educators Biology (007) Exam

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A biology teacher wants students to test whether an antimicrobial disk inhibits bacterial growth. What is the best role of a blank paper disk placed on the same agar plate?

It serves as a negative control for the disk material itself It increases the concentration of antimicrobial around the plate It provides nutrients needed for bacterial growth It confirms that all bacteria on the plate are pathogenic

Correct Answer:

It serves as a negative control for the disk material itself

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