Test: GRE Subject Test: Biology

In a small village, a doctor over-prescribed Ciprofloxin (an antiobiotic) to his patients. The result was that the majority of his patients had developed a new strain of bacteria that had become resistant to Ciprofloxin. 

1.

What is a possible route that may have caused these bacteria to become antibiotic resistant?

The antibiotic lost its potency

The bacteria developed a way to prevent the antibiotic from entering into their cells

The antibiotic resistant bacteria had the ability to degrade the antibiotic in their lysosomes

An antibiotic resistant gene was passed on through the plasmids in a group of antibiotic resistant bacteria

The bacteria learned to metabolize the antibiotic

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