| Cell type | Ribosome size | Subunit | rRNA component | Proteins |
|---|---|---|---|---|
| Bacterial | 70S | Large (50S) | 23S (2900 nucleotides), 5S (120 nucleotides) | 31 |
| Small (30S) | 16S (1500 nucleotides) | 21 | ||
| Eukaryotic | 80S | Large (60S) | 28S (4700 nucleotides), 5.8S (160 nucleotides), 5S (120 nucleotides) | 49 |
| Small (40S) | 18S (1900 nucleotides) | 33 |