Spirochetes
-helical chemoheterotrophs, sometimes long
-rotation of internal, flagellalike filaments
(corkscrelike movements)
-both free-living species & pathogens
Chlamydias
-Obligate intercellualr parasites of animals
-Obtain ATP from host cells
-gram-net. cell walls(unusual in bact.)
Gram-Positive Bacteria
-Most are gram-posit.
-Some gram-neg.(put in grp b/c close relat. to gram
posit. bact.)
Cyanobacteria
-Photoautotrophs w/ plantlike photosynth.
-Have chlorophyll a & use 2 photosyt.(to split H20
yield O2 by-product)
-Most inhabit fresh water(also marine species &
symbionts)
-Single-cell forms,colonial species, & true
multicellular bact.
Proteobacteria (Subgrps: Purple bacteria,
Chemoautotrophic proteobacteria, Chemoheterotrophic
proteobacteria)
Purple Bacteria
-Photoautotrophs/photoheterotrophs w/
bacteriochlorophylls built into inpocketings of plasma
membrane
-Extract electrons form molecules other than H2O
-Release no oxygen
-Most species are obligate anaerobes
-found in sediments of ponds,lakes,mudflats
-Many species flagellated
Chemoautotrophic proteobacteria
-Free-living & symbiotic species
-Many play key roles in chemical cycles of ecosyt.
Chemoheterotrophic proteobacteria
-Includes enteric bact.(inhabit intestinal tract of
animals)
-Most enteric are rod-shaped facultative anaerobes.
-Many are harmless, others pathogenic
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