Micro Organisms
Mycoplasmas are different from the other prokaryotes by

presence of proteins in cell walls
presence of murrain in cell walls
absence of cell wall itself
presence of chitin in cell walls

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Micro Organisms
Archeal cells usually do not contain peptidoglycan, rather contain pseudo-peptidoglycan which is mainly composed of

N-acetylmuramic acid and L-amino acids
N-acetyltalosaminuronic acid and D-amino acids
N-acetyltalosaminuronic acid and L-amino acids
N-acetylmuramic acid and D-amino acids

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