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.
Peptidoglycan is a huge polymer of interlocking chains composed of similar monomers. The backbone of the peptidoglycan molecule is composed of two derivatives of glucose: NAG & NAM.
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.
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