Micro Organisms
Which of the following is not true for eukaryotic cells?

Gas vacuoles are present
Chromosomes contain histones
Chloroplasts and mitochondria contains 70S ribosomes
Nucleus is bounded by nuclear membrane

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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
habitats which are extreme environments with regard to acidity
absence of a nuclear membrane temperature
cytoplasmic ribosomes that are 70S

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