Endosymbiosis

1
Endosymbiosis
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Evidence of Symbiosis

• Both mitochondria and chloroplasts contain DNA,
  which is fairly different from that of the cell
  nucleus, and that is similar to that of bacteria
  (circular and smaller).
• They are surrounded by two or more membranes, and
  the innermost of these shows differences in
  composition compared to the other membranes in
  the cell. The composition is like that of a
  prokaryotic cell membrane.
• New mitochondria and chloroplasts are formed only
  through a process similar to binary fission.
• Much of the internal structure and biochemistry
  of chloroplasts, for instance the presence of
  thylakoids and particular chlorophylls, is very
  similar to that of cyanobacteria.
• The size of both organelles is comparable to
  bacteria.
• These organelle's ribosomes are like those found
  in bacteria (70s).