(from the greek words meaning prenucleus) are as follows
1.their dna is not enclosed within a membrane and is usually a singular circularly arranged chromosome.(some bacteria,such as vibrio cholerae,have tow chromosomes,and some bacteria have a linearly arranged chromosome.)
2.their dna is not associated with histones (special chromosomal proteins found in eukaryotes);other proteins are associated with the dna
3.they lack membrane-enclosed organelles.
4.their cell walls almost always contain the complex polysaccharide peptidoglycan.
5.they usually divide by binary fission.during this process,the dna is copied,and the cell splits into two cells.binary fission involves fewer structures and processes than eukaryotic cell division.