A 38-year-old woman, who works as an administrative assistant for a large company, opened a package and found a suspicious white powder. Analysis of the powder indicates that it contained traces of the bacterium Bacillus anthracis. The woman was treated with ciprofloxacin, an effective antibiotic. Ciprofloxacin’s mechanism of action is best described as an inhibition of which of the following?
A. Bacterial dihydrofolate reductase
B. Bacterial peptidyl transferase activity
C. Bacterial RNA polymerase
D. DNA gyrase
E. DNA polymerase III
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