Why do we keep negative control while doing any drug assay?
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A negative control is part of a well-designed scientific experiment. The negative controlgroup is a group in which no response is expected. It is the opposite of the positive control, in which a known response is expected. College Biology: Help and Review / Science Courses
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Because water shouldn't allow bacteria to grow you wouldn't expect to see anything. In the chance that organisms do grow, you can attribute the growth to the contaminated water instead of the failure of the new antibacterial agent. You want negative controls to verify that there's nothing wrong with any of the materials your using.
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