Micro Organisms
The membranes of which domains are chemically the most similar?

Eukarya and Archaea
membranes of all three domains are chemically identical
Archaea and Bacteria
Bacteria and Eukarya

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

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

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