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             Prokaryote cells are known to exist in all environments where eucaryote cells are known to live, as well as in many considered to extreme for eucaryotic cells to live. Where prokaryote cells and eucaryote cells live there may be a mutalistic relation ship between the two that allows both forms of life to live. Some people speculate that some of the organelles of eucaryote cells are remnants of bacteria that invaded primitive eucryote cells. Many of the eucaryotic cells we know today are inhabited by endosymiotic prokaryotes. .

             The metabolism in prokaryotic cells is extremely diverse and some have never been seen in or rarely in eucaryote cells. The process of nitrogen fixation and mehtanogensis are unique to prokaryote cells and has an enormous impact on the nitrogen and carbon cycles in the environment. Also unique ways of producing energy have also bees discovered in prokaryote cells that have never been seen in eucaryote cells.

             The lives of plants and animals rely heavily on the process of the prokaryotic cells. Prokaryote cells have produced most of the atmospheric oxygen that you and I breathe. The prokaryotes fix nitrogen and a substantial amount of CO2. The metabolic activity of Prokaryote cells in soils have an enormous impact on the soil fertility, They also drive the cycles of elements that make up living systems. .

             PROKARYOTE STRUCTURE AND FUNCTION.

             Prokaryote cells are distinguished from eucaryote cells mainly on the lack of nuclear organization, more specifically a nuclear membrane. But other dissimilarities include a lack of intracellular organelles and structures that are characteristic of eucaryotic cells. The functions of the organelles that a prokaryote cell lack are made up by the prokaryotic plasma membrane.

             Prokaryotic cells have three regions: appendages in the form of flagella and pili ; a cell envelope consisting of a cell wall and plasma membrane: and a cytoplasmic region that contains DNA and ribosome.