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According to the endosymbiosis theory, chloroplasts and mitochondria are derived from bacteria that took up residence...

According to the endosymbiosis theory, chloroplasts and mitochondria are derived from bacteria that took up residence within eukaryotic cells. At one time, prior to being taken up by eukaryotic cells, these bacteria were free-living organisms. However, we cannot take a chloroplast or mitochondrion out of a living eukaryotic cell and get it to survive and replicate on its own. Why not?

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Answer : Though chloroplasts and mitochondria are considered as semiautonomous organelles, partly  their structure and functioning are under the control of nucleus of the cell and availability of biosynthetic machinery/materials from the cytoplasm. Because these organelles are partially dependent on the nucleus they cannot themselves survive and propagate without the ingluence of nuclear encoded genes.

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