Each circular well has a sample of M.tuberculosis, the bug that causes TB. The top two wells have no antibiotic, so they give you an idea of how well the bug grows. The series of 5-8 wells shown below all a single antibiotic whose dose doubles each time you move a well to the right. In the example above that means the dosage in well 6 is 2x2x2x2x2x2=64 times higher than the dosage in well 1. You simply have to answer a question about how the bacteria are growing and if there is a dose of antibiotic above which the bacteria don’t grow.
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