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A mitochondrion is itself an organelle.

However, it does contain its own ribosomes. Ribosomes are regarded as organelles when they occur either free in the cytoplasm or attached to the rough endoplasmic reticulum.

The theory of the endosymbiotic origin of mitochondria (and chloroplasts) states that mitochondria are descendants of free-living prokaryotic cells (bacteria). Bacteria contain ribosomes, and so do mitochondria and chloroplasts.

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17y ago

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