<prompt> Which antibiotic acts by inhibiting protein synthesisCefotetanDoxycyclineCiprofloxacinOxacillin  <response>: Ref Goodman Gilman 11e p 1173 Doxycycline is a tetracycline that act by inhibiting protein synthesis Cefotetan and oxacillin are beta lactam antibiotics that act by inhibiting cell wall synthesis Ciprofloxacin is a Fluroquinolone that acts by inhibiting DNA gyrase 