70s 80S MW2.500.000 MW4,200,000 509 30S 40S MW1.600.000 MW900.000 MW2.800.000 MW1,400.000 5S rRNA 23S rRNA 16S rRNA 5S rRNA 28S rRNA 5.8S rRNA 18S rRNA 120 120 160 nucleotides 2900 1540 nucleotides nucleotides 1900 nucleotides nucleotides nucleotides 4700 nucleotides 34 proteins 21 proteins -49 proteins ~33 proteins PROCARYOTIC RIBOSOME EUCARYOTIC RIBOSOME Figure 6-20 A comparison of the structures of procaryotic and eucaryotic ribosomes.Ribosomal