What type of bacteria create endotoxins?

• A. Gram-negative.
• B. Gram-positive.
• C. Both gram-negative & positive.
• D. Endotoxins are only produced by protozoa.

Answer: (A)

Verified step by step guidance

1. Understand the concept of endotoxins: Endotoxins are toxins that are part of the outer membrane of the cell wall of Gram-negative bacteria. They are lipopolysaccharides (LPS) and are released when the bacteria die and the cell wall breaks apart.
2. Differentiate between Gram-negative and Gram-positive bacteria: Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides, while Gram-positive bacteria have a thick peptidoglycan layer and lack an outer membrane.
3. Recognize that endotoxins are associated with the lipopolysaccharide component of the outer membrane of Gram-negative bacteria, which is absent in Gram-positive bacteria.
4. Consider the options given: Since endotoxins are specifically linked to the structure of Gram-negative bacteria, evaluate which option correctly identifies the type of bacteria that produce endotoxins.
5. Conclude that Gram-negative bacteria are the type that create endotoxins, as they possess the necessary structural components (lipopolysaccharides) in their outer membrane.