Endotoxins are associated with which bacterial feature?

Endotoxins are associated with which bacterial feature?

• A. Viral envelopes
• B. The thick peptidoglycan layer of Gram-positive bacteria
• C. The outer membrane of Gram-negative bacteria
• D. Fungal cell walls

Answer: (C)

Endotoxins come from the outer membrane of Gram-negative bacteria, specifically the lipopolysaccharide (LPS) layer. The toxic component, lipid A, can trigger strong inflammatory responses that lead to fever and septic shock. Endotoxins are not secreted toxins; they’re part of the cell envelope and are released mainly when bacteria die or lyse. Because Gram-negative bacteria have this outer membrane, they house endotoxins, whereas Gram-positive bacteria lack an outer membrane and rely on other cell-wall components and exotoxins. Viral envelopes and fungal cell walls are unrelated to bacterial endotoxins.

Endotoxins come from the outer membrane of Gram-negative bacteria, specifically the lipopolysaccharide (LPS) layer. The toxic component, lipid A, can trigger strong inflammatory responses that lead to fever and septic shock. Endotoxins are not secreted toxins; they’re part of the cell envelope and are released mainly when bacteria die or lyse. Because Gram-negative bacteria have this outer membrane, they house endotoxins, whereas Gram-positive bacteria lack an outer membrane and rely on other cell-wall components and exotoxins. Viral envelopes and fungal cell walls are unrelated to bacterial endotoxins.