1) Endosymbiotic Theory (Endosymbiosis)

1) Endosymbiotic Theory (Endosymbiosis) - with nucleus When...

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AP Biology Endosymbiotic Theory (Endosymbiosis) 1) Background Information a) This theory explains how the eukaryotic organisms are originated from prokaryotic cells with specific evidence b) Mitochondria & plastids (anything similar to chloroplasts) in the eukaryotic cells came from free-living prokaryotic cells c) First, we need to consider two term; these two key terms must be differentiated Endosymbionts = A cell that lives in another cell Host cell = A cell that provides the place for endosymbionts d) The reality used to explain endosymbiosis is that the relationship between endosymbiont and host is changed from parasitic to mutualistic 2) Process a) We have an ancestral prokaryotes that only have organelles to sustain their basic lives: cytoplasm, DNA, and cellular membrane b) Enfolding of plasma membrane results in formation of endomembrane structure
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Unformatted text preview: with nucleus When the prokaryotic cell only engulfs aerobic heterotrophic prokaryotes, then it will become ancestral heterotrophic eukaryotes When the prokaryotic cell engulfs photosynthetic organism after engulfing aerobic heterotrophic prokaryotes, then it will become ancestral autotrophic eukaryotes (cyanobacteria) 3) Evidence a) Enzymes and transport chain from endomembrane system are similar to the plasma membrane of prokaryotic cell b) Mitotic division of chloroplast and mitochondria in the cell is similar to binary fission of prokaryotes c) Single circular DNA from mitochondria and chloroplasts is similar to single circular DNA found in prokaryotes (not associated with histones) d) Size, nucleotide size, and sensitivity to certain antibiotics <Figure 1> Endosymbiosis (Endosymbiotic Theory)...
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1) Endosymbiotic Theory (Endosymbiosis) - with nucleus When...

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