Endosymbiotic Theory Essay

The endosymbiotic theory clarifies the development of the eukaryotic cell and eukaryotic organelles by phagocytocis of small prokaryotic cells. This theory states that some of the organelles in today's eukaryotic cells were once prokaryotic bacteria.

With this theory, the first eukaryotic cell was probably an amoeba-like nucleated (probably DNA in a nucleoid region not an actual nucleus) prokaryotic cell that received nutrients by simply phagocytosis (engulfing nutrients or perhaps other cells) Some of these unicellular amoeba-like organisms engulfed prokaryotic cells that somehow weren't digested inside the organism. At the same time of being swallowed up the smaller cells would have been wrapped in membrane in the larger cell, today we come across double walls in mitochondria and chloroplasts. The symbiotic relationship was beneficial because the host cell would have presented essential nutrients to the engulfed prokaryotic cell in return the smaller prokaryotic cell utilized these nutrition to synthesize ATP elements, this ATP was used since an energy source by the number cell. The smaller prokaryotic cell was given a secure environment as well as receiving nutrition from the much larger host cellular.

The small prokaryotic cell developed a symbiotic (mutually beneficial) relationship together with the host cellular. This more compact prokaryotic cellular would sooner or later become mitochondria or chloroplasts. Mitochondria may have been shaped when bacterias capable of aerobic respiration were taken in by a bigger cell. Chloroplasts formed when photosynthetic bacteria were ingested. They at some point lost their cell wall and much of their DNA since they were not really of benefit within the host cell. Mitochondria and chloroplasts cannot grow outside their number cell in normal conditions because they now depend on the cell for protection and nutrients. The key reason why we do not see this type of symbiotic relationship today is because conditions are much different now chances are they were on earth millions of yrs ago when this kind of symbiotic...

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