Abstract

Mitochondrial ribosomal RNA from Aspergillus nidulans has been visualized in the electron miscroscope and compared to its homologous cytoplasmic ribosomal RNA and to Escherichia coli ribosomal RNA. The mean chain lengths of the two mitochondrial ribosomal RNA components are found to be 0.47 and 0.91 μ, whereas those of cytoplasmic ribosomal RNA are 0.52 and 1.10 μ and those of E. coli ribosomal RNA are 0.40 and 0.72 μ. Based upon its length, mitochondrial ribosomal RNA appears larger in size than bacterial-type ribosomal RNA but smaller than cytoplasmic ribosomal RNA.

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