One way in which organisms may exhibit resistance to a drug is the ability to pump the drug out of the cell immediately after it has entered.

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Quizplus · Accepted Answer

This is called efflux pumping, and it is a common mechanism for drug resistance in many types of bacteria and cancer cells. By pumping drugs out of the cell, the organism can reduce the concentration of the drug inside the cell, making it less effective.

One Way in Which Organisms May Exhibit Resistance to a Drug