Bacteria and It's Character

Bacteria and It's Character

Bacteria:  

Bacteria are unicellular organism, having the properties of growth and multiplication and capacity to produce disease in man and animals. They are minute microscopic organism having a prokaryotic cell structure. The chromosomal DNA of the bacteria is a circle and they can replicate extra- cellular.

General character:

  1.Shape: Spherical , rod , curved& bean shaped.

  2.Size: 1 µ m in diameter.

  3.Habitual: Most of the bacteria are free living few live in                                   intra-cellular.

  4.Cell wall: Most have cell wall.

  5.Motility: May motile e.g. Salmonella spp. & non motile e.g                              Kebsiella spp

  6.Capsule: May present, e.g.

-Streptococcus pneumonia.

-Klebsiella pneumonia

-Staphylococcus aureus

May absent e.g : Salmonella typhi

-Shigella spp

  7.Spore: May present or not.

  8.Flagella: May present or not.

  9.They liberate toxin and produce diseases.

  10.They can grow and multiply in artificial culture media

  11.Reproduction: By binary fission.