Microbiology question? need urgent!

Posted on 2017-05-16 18:26:00 in Biology by ANGELO

With an antibiotic concentration of 2ug/ml, an inhibitory zone of diameter 5mm is produced against the target bacterium. With a disc containing 4ug/ml of the same antibiotic, an inhibitory zone of 8mm diameter is produced, and with a disc containing 8ug/ml of antibiotic the zone was 10mm. Why, when the concentration of antibiotic is doubled does the zone of inhibition of growth not double?

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