5. Choose a correct statement related to antimicrobial chemotherapy. (A) Fluoroquinolones block bacterial DNA replication, by inhibiting DNA gyrase and topoisomerase II. (B) Tetracyclines are antibacterial drugs that can inhibit the synthesis of peptidoglycans, the important component of bacterial cell wall. (C) Penicillins are bactericidal by inhibiting bacterial cell membrane synthesis. (D) Cephalosporins are a class of beta-lactam antibiotics and can disrupt bacterial protein synthese. (E) The Bradford assay is commonly used to measure antimicrobial activity of an antibacterial drug.