Micro Organisms
Mycoplasmas are different from the other prokaryotes by

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

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Micro Organisms
The unifying feature of the archaea that distinguishes them from the bacteria is

cytoplasmic ribosomes that are 70S
habitats which are extreme environments with regard to acidity
presence of a cell wall containing a characteristic outer membrane
absence of a nuclear membrane temperature

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