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30 July, 20:27

Consider the uninoculated sim tube. is it a positive or a negative control in each test

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  1. 30 July, 20:29
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    It is a negative control. It minimizes concern about false positive results. No ingredients within the medium which can produce a positive effect at any stage of testing. It shows the original colour changes. Experiemental may not be apparent without comparison to the original.
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