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

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

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Micro Organisms
A characteristic of protein synthesis in both the archaea and eukarya is

transcription and translation are coupled
proteins are synthesized from D-, rather than L-, isomers of amino acids
translation is inhibited by diphtheria toxin
the initiator tRNA is charged with N-formyl-methionine

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