filaments animals nucleolus ribosome production protein-DNA-RNA most eukaryotes parenthesome not characterized not characterized fungi peroxisome breakdown of metabolic hydrogen peroxide single-membrane compartment all eukaryotes ribosome translation of RNA into proteins RNA-protein eukaryotes, prokaryotes vesicle material transport single-membrane compartment all eukaryotes Other related structures: cytosol endomembrane system nucleosome microtubule cell membrane (A)