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Que. Which of the following is exposed on the outer surface of a gram-negative bacterium?
a. O-antigen of lipopolysaccharide (LPS)
b. Polysaccharide portion of lipoteichoic acid (LTA)
c. Braun lipoprotein
d. Electron transport system components
Correct Answer:O-antigen of lipopolysaccharide (LPS)
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