The organisms are anaerobic and do not evolve O2 during photosynthesis. Oxygenic phototrophic bacteria which contain chlorophyll can use light as an energy source and evolve O2 in a manner similar to that of green plants. The group includes the cyanobacteria. A Chemolithotrophis bacterium is gram negative non phototrophic bacteria that obtain energy for carbon dioxide fixation from the oxidation of ammonia, nitrate, reduced sulfur compounds or ferrous iron. Archacobacteria is a gram positive or gram negative bacteria that are4 phylogenetically distinct from eubacteria. Some produce methane gas, some require unusually high levels of NaCl for growth, other are distinguished by their ability to grow at a low PH and a high temperature.
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