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Prokaryotes (Classification), First organisms to inhabit the earth. Most…

- - - - less peptidoglycan and an outer membrane contains lipopolysaccharides
      - include photoautotrophs, chemoautotrophs, and heterotrophs
      - anaerobic and aerobic
    - - Closely associated with eukaryotic hosts
        
        Rhizobium, Agrobacterium etc..
    - - nutritionally diverse
        
        Other members include aquatic species and pathogens
    - - Autotrophic members include sulfur bacteria like Thiomargarita namibiensis
        
        Some heterotrophs are pathogenic, such as Legionella, Salmonella, and Vibrio cholerae
        
        Escherichia coli resides in intestines of many mammals , however, not normally pathogenic
    - - the slime-secreting myxobacteria, which produces drought-resistant "myxospores"
      - bdellovibrios, which mount high-speed attacks on other bacteria
    - - Most of them are pathogenic
        
        Examples - Campylobacter, which causes blood poisoning,
        and Helicobacter pylori, which causes stomach ulcers
  - - - Solitary species include Bacillus anthracis, Staphylococcus, and Streptococcus species
        
        Mycoplasmas, the smallest known cells, lack cell walls
  - - - Some are parasites
  - - - Common in freshwater and marine phytoplankton
        
        Plant chloroplasts likely evolved from cyanobacteria
- - - - live in highly saline environments
    - - thrive in very hot environments
    - - Live in swamps and marshes, produce methane as a waste product
        
        strict anaerobes and poisoned by O2