Micro Organisms
Which of the following may account for the small size of the cells?

The surface area/volume ratio
The number of mRNAs that can be produced by the nucleus
The rate of diffusion
All of these

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

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

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