Bacteria Containing Recombinant Plasmids Are Often Identified by Which Process

Bacteria containing recombinant plasmids are often identified by which process?

A) examining the cells with an electron microscope
B) using radioactive tracers to locate the plasmids
C) exposing the bacteria to an antibiotic that kills cells lacking the resistant plasmid
D) removing the DNA of all cells in a culture to see which cells have plasmids
E) producing antibodies specific for each bacterium containing a recombinant plasmid