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Chapter 27 (prokaryotic (capsule (is the celll wall tat is surrounded by a…

- - - - Gram- positive
        
        walls composed of a thick layer of peptidoglycan
      - Gram- negative
        
        have less peptidoglycan and are structurally more complex, with an outer membrane that contains lipopolysaccharides (carbohydrates bonded to lipids
- - - - Halobacterium have red pigments and can leave among the most salt- tolerant places.
      - Bacteria
        
        a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease
      - Archaea
        
        constitute a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes.