Difference between 70S and 80S Ribosomes (Prokaryotic vs Eukaryotic Ribosomes)

Types of Ribosomes: 70S and 80S Ribosomes
Prokaryotic and Eukaryotic Ribosomes
70S and 80S
Difference Between: 70S and 80S Ribosomes 
(Prokaryotic & Eukaryotic Ribosomes)

70S Ribosomes

80S Ribosomes


They are found in prokaryotic cells(Bacteria, and   Cyanobacteria )
They are found in eukaryotic cells (Algae, Fungi, higher plants and animals).

Sedimentation Coefficient
64S to 72S
79S to 85S (Fungi) and 80S (Higher plants and animals)

Subunits & Molecular weight of Subunits
Larger 50S and smaller 30 S

Mol weight of Subunits
  • 50S subunit-1.8 x 106
  •  30S subunit-1.0 x 106
Larger 60S and smaller 40S

Mol weight of Subunits
  • 60S subunit-2.7 x 106
  • 40S subunit-1.3 x 106

They are comparatively smaller than 80S  ribosomes
They are comparatively larger than 70S  ribosomes

Molecular Weight
3x106 daltons
4-5x106 daltons

RNAs & Molecular Weight
50S Subunit: 23S, 16S and 5S Subunits

30S Subunit: 16S r-RNA

Molecular Weight of RNA:

 23S RNA-1.2 X106
16S RNA- 0.6 X106
 5S RNA-3.2x104
60S Subunit: 25S or 28 S, 5.8 Sand 5S Subunits

40S Subunit: 18S r-RNA

Molecular Weight of RNA:
28S RNA-1.7 X106
18S RNA- 0.7 X106
5.8S RNA-3.5x104
5S RNA-3.2x104

Number of Proteins & Molecular weight
In 50S subunit-34
In 30S subunit-21
Average molecular weight of proteins: 1.8x104
In 60S subunit-49
In 40S subunit-33
Average molecular weight of proteins: 2.1 x104

RNA: Protein
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