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Question

The characteristic of Gram - negative bacteria is
  1. Presence of porins
  2. >10% lipids in the cell wall
  3. Endotoxins
  4. All of the above

A
Presence of porins
B
>10% lipids in the cell wall
C
Endotoxins
D
All of the above
Solution
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Gram - negative bacteria display the following characteristics: outer membrane containing lipopolysaccharide (which consists of lipid A, core polysaccharide, and O antigen) in its outer leaflet and phospholipids in the inner leaflet; porins exist in the outer membrane, which act like pores for particular molecules; lipoproteins are attached to the polysaccharide membrane.

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