Bonding Structure of Peptidoglycan

Bacterial Cell Wall Structure 
Location and Amount of Peptidoglycan in Gram+ vs. Gram- Bacteria

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Peptidoglycan (pep-tid-o-gly-can) is a molecule found only in bacterial cell walls  The rigid structure of peptidoglycan gives the bacterial cell shape, surrounds the plasma membrane and provides prokaryotes 
with protection from the environment.

Article Summary: The amount and location of peptidoglycan in the prokaryotic cell wall is what determines whether a bacterium is Gram-positive or Gram-negative.
Bacterial Cell Wall Structure: Gram + & Gram -
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Prokaryotic Cell, Mariana Ruiz
Gram Positive Stained Staphylococcus Bacteria @ 1000xTM
Gram-positive Staphylococcus. Thick peptidoglycan cell wall retains crystal violet primary Gram stain. Go to > 
More Gram Stain Photos
Gram positive cell wall structure
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Peptidoglycan is a huge polymer of interlocking chains composed of similar monomers. The backbone of the 
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Continued ... Go to PAGE 2 >
Bonding Structure of Peptidoglycan
Gram-positive Cells
In Gram-positive cells, peptidoglycan makes up as much as 90% of the thick, compact cell wall, which is the outermost structure of Gram + cells.

peptidoglycan molecule is composed of two derivatives of glucose: NAG & NAM. Strands of NAG (N-acetylglucosamine) and NAM (N- acetylmuramic acid) are connected by interpeptide bridges.

See Page 2 for a diagram of the Gram-negative cell wall and a video on Gram Staining!