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

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

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Bacteria Morphology
The next to last step in peptidoglycan biosynthesis is

linking the sugar of the disaccharide-peptide unit to the growing peptidoglycan chain
synthesis of the NAM-peptide subunit
removal of the subunit from bactoprenol
cross-linking the peptide side chains of peptidoglycan

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