Thick peptidoglycan layer
Gram-positive cell walls are more robust than gram-negative cell walls because of the thickness of the peptidoglycan layer.
A lipopolysaccharide-containing outer membrane surrounds the peptidoglycan cell wall that encases gram-negative bacteria. In contrast to Gram-negative bacteria, which have an outer membrane, gram-positive bacteria have layers of peptidoglycan that are many times thicker.
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