Chloroplasts and mitochondria of eukaryotes contain DNA and ribosomes and make some, but not all, of their proteins. Some of their proteins are coded for by sequences found in the nuclear DNA and are produced in the cytoplasm. What might explain this division of labor? Over the course of evolution, some of the original endosymbionts were transferred to the host cell nucleus. The host cell #x27;s genome has always included genes for making mitochondrial and plastid proteins. Some mitochondria and chloroplasts were contributed by early bacterial prokaryotes that shared genes with other primitive cells. The smaller prokaryotic ribosomes in these organelles cannot produce eukaryotic proteins required for their function.
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