Layer outside the cell wall, usually made of polysaccharide.


Distinct and gelatinous. Enables bacteria to adhere to specific surfaces; allows some organisms to thwart innate defense systems and thus cause disease.

Slime layer

Diffuse and irregular. Enables bacteria to adhere to specific surfaces.

Cell wall

Peptidoglycan is the molecule common to all bacterial cell walls. Provides rigidity to prevent the cell from lysing.


Thick layer of peptidoglycan that contains teichoic acids and lipoteichoic acids.


Thin layer of peptidoglycan surrounded by an outer membrane.The outer leaflet of the outer membrane is lipopolysaccharide.

Cell Boundary

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