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Ribosome in Mitochondria and chloroplasts

How is the finding of ribosome within mitochondria and chloroplasts described?

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This is a strong hypothesis which chloroplasts and mitochondria were prokaryotes that related to primitive eukaryotic cells beneath mutualism (that is, gaining protection and providing energy). This elucidates why within such organelles there are DNA and protein synthesis machinery, comprising ribosomes. This hypothesis is termed as the endosymbiotic hypothesis on the origin of chloroplasts and mitochondria.

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