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Question
Which of the following is exposed on the outer surface of a gram-negative bacterium?
Options:
A .  O-antigen of lipopolysaccharide (LPS)
B .  Polysaccharide portion of lipoteichoic acid (LTA)
C .  Braun lipoprotein
D .  Electron transport system components
Answer: Option A
Answer: (a).O-antigen of lipopolysaccharide (LPS)

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