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
B- Polysaccharide portion of lipoteichoic acid (LTA)
C- Braun lipoprotein
D- .Electron transport system components