Micro Organisms
Which of the following microorganisms is classified as a member of archaebacteria?

Methanobacteria
Gyanobacteria
Trichomonads
Mycoplasma

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

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

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