70S 80S 原核生 真核生 物核糖 物核糖 体组成 体组成 MW2.500,000 MW4,200.000 50S 30S 60S 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 5 120 120 160 1900 nucleotides 2900 1540 nucleotides nucleotides nucleotides nucleotides nucleotides 4700 nucleotides 34 proteins 21 proteins -49 proteins -33 proteins EUCARYOTIC RIBOSOME PROCARYOTIC RIBOSOME原核生 物核糖 体组成 真核生 物核糖 体组成