Prokaryote cells, with a cell membrane but without membrane bound nuclei or other membrane enclosed organelles.

Cell wall usually consists of a peptidoglycan, a polymer of mixed sugars and amino acids.

Two forms of cell walls: a thin wall-Gram negative and a thick wall Gram positive.

Gram positive bacterial cell wall retains crystal violet stain while the Gram negative bacteria does not retain the stain.

The Gram negative bacteria cell membrane is sandwiched between two phospholipid bilayer membranes.

Classified on the basis of Gram stain, shape, and form of respiration.

Require iron as an essential nutrient for survival and virulence, and for cellular biosynthetic pathways, including DNA replication and bacterial respiration.

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