<prompt> beta - Lactamases cause resistance topenicillins and cephalosporins byBreaking one chemical bondBreaking two chemical bondsAdding amino NH2 groups to a moleculeInhibiting transpeptidase enzymes  <response>: Penicillins and cephalosporins are called beta-Iactam drugs because of the importance of the intact BETA-lactam ring for antimicrobial activity. -Lactamases inactivate these drugs by breaking the single bond in their BETA-lactam ring. BETA-Lactamases are coded for by either a transferable plasmid or by the genome of the organism. Plasmids are extrachromosomal genetic elements that may be transferred among unrelated bacteria. 