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| Bacterial ribosome | Eukaryotic ribosome | |
|---|---|---|
| Size | 70S*, 2.3–2.6 MDa | 80S, 3.3–4.5 MDa |
| Small subunit | 30S | 40S |
| Approximately 20 proteins | 32 proteins | |
| 16S rRNA, ∼1600 nucleotides | 18S rRNA | |
| Large subunit | 70S | 60S |
| Approximately 33 proteins | 79–80 proteins | |
| 23S rRNA, ∼2900 nucleotides | 25S rRNA | |
| 5S rRNA, ∼120 nucleotides | 5.8S & 5S |
S stands for the Svedberg unit for sedimentation velocity.
