All Bacteria have the following characteristics:

  • Unicellular and stick together in colonies
  • Are prokaryotic (no nucleus, vacuoles, mitochondria or chloroplasts)
  • They have a single chromosome in a DNA loop
  • They reproduce asexually by binary fission
  • Live in moist environment and are inactive in dry environments

Two groups of Bacteria

1. Archaebacteria – primitive bacteria that live in harsh environments

2. Eubacteria – most common bacteria eg: E. Coli

Other ways of classifying bacteria are:

3. Aerobic or anaerobic

4. Autotroph or heterotroph

Bacteria Reproduction:


– similar to mitosis (simple cell division)


  1. DNA replicates (doubles)
  2. a cross wall forms dividing the cell into two identical bacteria

Some bacteria (eg: E.Coli and Salmonella) reproduce by conjugation (sexual reproduction)

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Cite this article as: William Anderson (Schoolworkhelper Editorial Team), "Bacteria Types and Classification," in SchoolWorkHelper, 2019,
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