Review Question - QID 5031

An 8-year-old girl presents to the emergency room with a 4-day history of limp and temperature 100.7 F. Lab results show a white blood cell count of 13,000 cells/µL (reference range, 4500-11000 cells/µL), hematocrit 33% (reference range, 41%-50%), and C-reactive protein of 14 mg/L (reference range, 0.08-3.1 mg/L). MR imaging demonstrates osteomyelitis of the proximal tibia without an abscess. During the work-up in the ER, the patient became hypotensive. What is the mechanism of action of the empiric antibiotic appropriate for this patient?