When are endotoxins typically released from a bacterial cell?

• A. During binary fission
• B. During active secretion by living bacteria
• C. When bacteria form endospores
• D. When the bacterial cell undergoes lysis

Answer: (D)

Verified step by step guidance

1. Understand that endotoxins are components of the outer membrane of Gram-negative bacteria, specifically lipopolysaccharides (LPS).
2. Recognize that endotoxins are not actively secreted by living bacteria, unlike exotoxins which are secreted proteins.
3. Recall that endotoxins are typically released when the bacterial cell wall is disrupted or destroyed, such as during cell lysis.
4. Note that binary fission and endospore formation are processes of bacterial growth and survival, but they do not cause the release of endotoxins.
5. Conclude that endotoxins are released primarily when the bacterial cell undergoes lysis, releasing the LPS into the surrounding environment.