Question

multiple choice question
which compound is well known to protect gram-negative bacteria from environmental toxic substances?

lps
fimbriae
teichoic acids
brauns lipoprotein

Explanation:

To solve this, we analyze each option:

• LPS (Lipopolysaccharide): It is a component of the outer membrane of Gram - negative bacteria. The outer membrane (where LPS is a key part) acts as a barrier, protecting the bacteria from many environmental toxic substances, antibiotics, and other harmful agents.
• Fimbriae: Fimbriae are mainly involved in adhesion (like attaching to host cells or surfaces) and not in protection from environmental toxins.
• Teichoic acids: These are found in the cell wall of Gram - positive bacteria, not Gram - negative, so they are not relevant here.
• Braun's lipoprotein: It functions to anchor the outer membrane to the peptidoglycan layer in Gram - negative bacteria, but its main role is structural anchoring rather than protection from environmental toxins.

Answer:

A. LPS