Plasmids:
Plasmids are numerous structure similar to nucleoid . It also contain many pieces of DNA and is also without cell membrane. It is 1/100 of nucleoid DNA and is circular innature . Generally they replicate autonomously but sometime some of them also integrate to form nucleoid DNA in presence of or help of nucleoid.
Plasmid during conjugation are also called episomes .This episome help in transfer of genetic material between different bacteria.
Bacteria cell also posses some gene which are resposnsible for the resistance to variety of antibiotic and production of certain protein antibiotic called Colicins or Bacteriocins.
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