<prompt> Tetracyclines inhibit protein synthesis by:Inhibition of initiation and misreading of mRNABinding to 30 S subunt and inhibiting the binding of aminoacyl-RNA to A siteInhibiting peptidyl transferase activityInhibiting translocation  <response>: The tetracyclines are primarily bacteriostatic; inhibit protein synthesis by binding to 305 ribosomes in susceptible organism. Subsequent to such binding, attachment of aminoacyl-t-RNA to the mRNA-ribosomc complex is interferred with. ESSENTIALS OF MEDICAL PHARMACOLOGY page no. 734 