Endotoxin exists in the cell walls of:
  1. Gram-positive bacteria
  2. Gram-negative bacteria
  3. Nonpathogenic bacteria
  4. All bacteria
Explanation
Answer: B - Endotoxins exist in the cell walls of gram-negative bacteria and consist of lipopolysaccharide, which increases pathogenic potential. The bacterium promotes bone resorption, chemotaxis of neutrophils, and inhibition of osteogenesis.
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