Outline 4_5.doc - Introduction (Slide o...

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Prokaryotic Cell Structure Introduction Cellular forms of life can be placed in one of the three “Domains of Life” ( Slide o Eubacteria (true bacteria)  o Archaebacteria (ancient bacteria) o Eukarya (eukaryotes)  Eubbacteria and Archaebacteria are PROKARYOTES – lack a nuclear membrane o Eurkaryotes (e.g. algae/plants, fungi/animals, protozoa) possess a nuclear  membrane ( Fig 3.25 ) (slide 2) Microbes, depending on the species, can be either prokaryotes or eukaryotes o Eukaryotes – Ex. Yeast Features of Bacterial Cells Size (Fig 1.4, 2.4) (slide 3) Generally, very small o However, very large size range, e.g. Mycoplasmas ~ 0.2   diameter.  E.  coli  ~ 2.5  Thiomargarita namibiensis  ~ 700  Shape 2 major shapes o Spghers or Cocci (sing. Coccus). Include:  Staphylococci (e.g.  Staph aureus ) – occur in graph –like clusters  (Fig  18.16a ) (slide 4) Diplococcu (e.g.  Neisseria gonorrhoeae;   N. meningitidis Fig  25.22a ) (slide 5) – pairs Streptociccu (e.g.  Strep. Pyogenes ) – chains ( Fig 18.16 b ) (slide 4) o Rods or bacilli (sing. Bacillus). Include: Bacilli – true rods (e.g.  Salmonella typhi,  Fig 2.6b ) (slide 6) Vibrio’s – comma-shaped ( Fig 25.18a ) (slide 7) NOTE : The term Bacillus describes both a “shape” and “genus” of bacteria  o Spirochaetes – flexible, helical rods ( Fig 18.46 ) (slide 8) Generalizations : Most cocci are Gram positive (notable exception:  Neisseria  species)
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