Definition of retain. transitive verb. 1a : to keep in possession or useb : to keep in one's pay or service; specifically : to employ by paying a retainerc : to keep in mind or memory : remember.
However, some gram- positive bacteria may also have capsules. Examples for gram-negative bacteria with capsules: Escherichia â¦coli, Klebsiella pneumoniae, Salmonella. Examples for gram-positive bacteria with capsules : Bacillus megaterium, Streptococcus pyogenes, Sterptococcus pneumoniae.
These bacteria are single celled organisms that can reproduce by division.These organisms have DNA and RNA codes just like the normal cells of the body. Some bacteria have an extra covering on the cell wall called a plasmid. The plasmid makes a bacterium more resistant to the common antibiotic.EG:Escherichia coli.