Abstract
Ribosomes from higher-plant [Phaseolus aureus] mitochondria contain 5S rRNA, in contrast with the mitochondrial ribosomes of animals and fungi, in which such a component was not detected. In common with the ribosomes of prokaryotes and chloroplasts, higher-plant mitochondrial ribosomes do not appear to contain an RNA equivalent to the 5.8S rRNA that is found in eukaryotes hydrogen-bound to the largest of the cytoplasmic rRNA species.