Bacteria Morphology
Which of the following is exposed on the outer surface of a gram-negative bacterium?

O-antigen of lipopolysaccharide (LPS)
Polysaccharide portion of lipoteichoic acid (LTA)
Electron transport system components
Braun lipoprotein

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Bacteria Morphology
Periplasm is

the area between the inner and outer membranes of gram-negative bacteria
the interior portion of mitochondria
the area between the inner and outer membranes of Gram-positive bacteria
the area outside the cell membrane that is influenced by the polymers

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