The Lipopolysaccharide (LPS) Layer is Found ONLY in the Cell

Question

The lipopolysaccharide (LPS) layer is found ONLY in the cell walls of
A) gram-positive Bacteria.
B) gram-negative Bacteria.
C) Archaea.
D) Eukarya.

Accepted Answer

The LPS layer, also known as endotoxin, is a major component of the cell wall of gram-negative Bacteria. The layer consists of lipids and polysaccharides, and plays a role in various functions such as protecting against host immune responses and regulating permeability. Gram-positive Bacteria do not have an LPS layer, but instead have a thick peptidoglycan layer in their cell wall. Archaea and Eukarya have different types of cell membranes and cell walls not containing LPS.