Features Gram Positive Organisms Gram negative Organisms Peptidoglycan Layer Thick and highly cross linked Thin and lightly cross linked Cellular Membrane Single Double- Inner & Outer Teichoic acid Present Absent Lipoteichoic acid Present Absent Pores Absent Present Lipopolysaccharide Absent Present Exotoxins Usually produced Usually not produced Endotoxins Usually absent Usually present Susceptibility to Beta lactam antibiotics Usually present Usually absent
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