Antibacterial agents can be classified with regard to their structure, mechanism of action, and activity pattern against various types of bacterial pathogens. Which of the following statement(s) is/are true concerning antimicrobial classes?
A.	Penicillins and cephalosporins share the compound structure of a b-lactam ring which binds to bacterial division plate proteins
B.	Tetracyclines and macrolides such as erythromycin inhibit bacterial ribosomal activity and therefore protein synthesis
C.	Aminoglycosides act in a similar fashion to tetracyclines and therefore are both bacteriostatic
D.	Sulfonamides and trimethoprim act synergistically to inhibit purine synthesis
Answer:A
Antibacterial agents can be classified with regard to their structure, mechanism of action, and activity pattern against various types of bacterial pathogens. Which of the following statement(s) is/are true concerning antimicrobial classes?
A.	Penicillins and cephalosporins share the compound structure of a b-lactam ring which binds to bacterial division plate proteins B.	Tetracyclines and macrolides such as erythromycin inhibit bacterial ribosomal activity and therefore protein synthesis C.	Aminoglycosides act in a similar fashion to tetracyclines and therefore are both bacteriostatic D.	Sulfonamides and trimethoprim act synergistically to inhibit purine synthesis