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

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

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Bacteria Morphology
The next to last step in peptidoglycan biosynthesis is

cross-linking the peptide side chains of peptidoglycan
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

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Bacteria Morphology
Gram positive cells have a

multiple layer of peptidoglycan that helps to retain the crystal violet stain
second outer membrane that helps to retain the crystal violet stain
periplasmic space that traps the crystal violet
thick capsule that traps the crystal violet stain

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