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Discussion

The endosymbiotic theory accounts for the origin of

  • A.ribosomes and the cytoskeleton
  • B.the plasma membrane and cell wall
  • C.mitochondria and chloroplasts
  • D.the nucleus and its envelope

Answer: C

Both organelles have their own circular DNA, 70S ribosomes and double membranes, and both divide independently of the cell. The evidence points to free-living bacteria taken up by an ancestral host cell, which retained rather than digested them.

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