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Endosymbiotic hypothesis (view source)
Revision as of 03:07, October 26, 2007
, 03:07, October 26, 2007typo
The '''Endosymbiotic hypothesis'' is a [[hypothesis]] used by evolutionists to explain the origin of certain cellular [[organelle]]s, specifically [[mitochondrion|mitochondria]] and [[chloroplasts]].
The '''Endosymbiotic hypothesis''' is a [[hypothesis]] used by evolutionists to explain the origin of certain cellular [[organelle]]s, specifically [[mitochondrion|mitochondria]] and [[chloroplasts]].
Evolutionists believe that early in the course of terrestrial life, all cells were [[prokayrote]]s.
Evolutionists believe that early in the course of terrestrial life, all cells were [[prokayrote]]s.
It is hypothesized that at some point, [[endophagocytosis]] occurred whereby one bacteria "hijacked" the energy producing potential of another by engulfing a respiring or photosynthesizing bacteria. Mitochondria and chloroplasts are the only organelles to contain their own [[DNA]] (other than the nucleus, which contains the DNA for the entire cell) and their DNA is well-conserved enough that they appear to be nearly separate organisms. DNA and [[RNA]] analyses have borne out much of this hypothesis. Further evidence supporting mitochondria and chloroplasts being endosymbionts lies in the fact that both organelles have plasma membrane bound spaces inside of their outer membranes, something no other organelle possesses.
It is hypothesized that at some point, [[endophagocytosis]] occurred whereby one bacteria "hijacked" the energy producing potential of another by engulfing a respiring or photosynthesizing bacteria. Mitochondria and chloroplasts are the only organelles to contain their own [[DNA]] (other than the nucleus, which contains the DNA for the entire cell) and their DNA is well-conserved enough that they appear to be nearly separate organisms. DNA and [[RNA]] analyses have borne out much of this hypothesis. Further evidence supporting mitochondria and chloroplasts being endosymbionts lies in the fact that both organelles have plasma membrane bound spaces inside of their outer membranes, something no other organelle possesses.