Discussion
In which of the following, lipo-polysaccharide is a major constituent of outer membrane of the cell wall?
Answer: B
Correct answer: Gram-negative bacteria
Lipopolysaccharide makes up the outer leaflet of the gram-negative outer membrane. Its lipid A portion is the endotoxin responsible for fever and shock in gram-negative sepsis, and its O-antigen the basis of serotyping. Gram-positive walls have no outer membrane, and fungi have no LPS at all.
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