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

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

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Micro Organisms
Genetic and biochemical similarities between contemporary cyanobacteria and eukaryotic chloroplasts are accepted to mean that

eukaryotes evolved from bacteria
oxygenic photosynthesis first evolved in eukaryotes
eukaryotes evolved from archaea
cyanobacteria arose from chloroplasts which escaped from plant cells

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

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

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