Micro Organisms
Mycoplasmas are different from the other prokaryotes by

absence of cell wall itself
presence of proteins in cell walls
presence of chitin in cell walls
presence of murrain 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-acetyltalosaminuronic acid and L-amino acids
N-acetyltalosaminuronic acid and D-amino acids
N-acetylmuramic acid and D-amino acids
N-acetylmuramic acid and L-amino acids

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