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

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

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Bacteria Morphology
Which of the following is not true about peptidoglycan?

It is a polymer consisting of N-acetyl glucosamine, N-acetyl muramic acid and amino acids (alanine, lysine, etc.)
None of these
It is present in prokaryotic cell wall
It occurs in the form of a bag shaped macro molecule surrounding the cytoplasm membrane

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