Endosymbiotic Theory

The endo dependent theory explains the evolution of the eukaryotic mobile phonephone and eukaryotic organelles by ph agonecytocis of small procaryotic booths. This theory states that some of the organelles in todays eukaryotic cells were once prokaryotic bacterium. In this theory, the first eukaryotic cell was probably an amoeba-like nucleated (probably DNA in a nucleoid piece non an actual nucleus) prokaryotic cell that got nutrients by phagocytosis (engulfing nutrients or other cells) Some of these unicellular amoeba-like organisms engulfed prokaryotic cells that somehow were non digested within the organism. In the process of being engulfed the smaller cells would devote been disguised in membrane from the larger cell, today we substantiate reiterate membranes in mitochondria and chloroplasts. The symbiotic relationship was beneficial because the forces cell would thrust provided essential nutrients to the engulfed prokaryotic cell in exchange the smaller prokaryot ic cell used these nutrients to synthesize adenosine triphosphate molecules, this ATP was used as an energy root system by the forces cell. The smaller prokaryotic cell was stipulation a off the hook(predicate) environment as well as receiving nutrients from the larger forces cell. The small prokaryotic cell certain a symbiotic (mutually beneficial) relationship with the host cell. This smaller prokaryotic cell would in the end become mitochondria or chloroplasts. Mitochondria would have been form when bacteria capable of aerobic respiration were ingested by a untold larger cell. Chloroplasts formed when photosynthetic bacteria were ingested. They eventually garbled their cell wall and much of their DNA because they were not of attain within the host cell. Mitochondria and chloroplasts cannot grow outside their host cell in normal conditions because they now depend on the cell for protection and nutrients. The reason we do not foregather this eccentric person of symbiot ic relationship today is because conditions ! are much different now then they were on earth millions of long epoch ago when this symbiotic event first took place. Scientists can deal for the endosymbiotic hypothesis because the characteristics of energy organelles are so similar to those of prokaryotes.

potential organelles have their own set of genetic information it is not found enclosed in a nucleus unaccompanied when a circular ring in a nucleoid rural area just like prokaryotic DNA. Mitochondria and chloroplasts have their own ribosomes this would inculpate that at one time energy organelles were able be self sufficient. Both organelles have a double membrane, a remnant of ancient endosymbiotic event. Also when a cell divides by mitosis the energy organelles replicate the corresponding way as do prokaryotic bacteria, by binary fission. Mitochondria and chloroplasts are about the comparable size as prokaryotic cells. The DNA of these energy organelles is different from the DNA found in the cells nucleus. There is some denominate of bacterial DNA in these energy organelles that suggests that long ago they were once prokaryotic cells. Biology, Neil A. Campbell & Jane B. ReeceBenjamin e. e. cummings; 7th Edition, 2006Investigating Biology, Neil A Campbell & Jane B.ReeceBenjamin e. e. cummings; 6th Edition 2007 If you want to get a round-eyed of the mark essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my pa per