Gram-positive bacteria have a net negative charge on their surface as a result of the presence of

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Teichoic acid molecules are found in the cell wall of Gram-positive bacteria and have a net negative charge on their surface. This negative charge helps to repel negatively charged molecules and may also contribute to the pathogenesis of some Gram-positive bacteria. Lipopolysaccharide is found in the outer membrane of Gram-negative bacteria and contributes to their net negative charge, while porins are membrane proteins that form channels in the outer membrane of Gram-negative bacteria. M proteins are a type of protein found in the cell wall of some Gram-positive bacteria but do not contribute to their net charge.

Gram-Positive Bacteria Have a Net Negative Charge on Their Surface