Final answer:
The lipopolysaccharide layer (LPS) is a characteristic of the wall of Gram-negative bacteria.
Step-by-step explanation:
The lipopolysaccharide layer (LPS) is a characteristic of the wall of Gram-negative bacteria. Gram-negative cells have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides (LPS) and lipoproteins. The LPS molecule is composed of Lipid A, a core polysaccharide, and an O side chain that varies between different species and strains of bacteria.