Types of ribosomes: 70S and 80S ribosomes

70S and 80S

Difference Between: 70S and 80S Ribosomes 

(Prokaryotic & Eukaryotic Ribosomes)

	70S Ribosomes	80S Ribosomes
1	Occurrence
	They are found in prokaryotic cells(Bacteria, Cyanobacteria and Viruses )	Thay are found in eukaryotic cells (Algae, Fungi, higher plants and animals).
2	Sedimentation Coefficient
	64S to 72S	79S to 85S (Fungi) and 80S (Higher plants and animals)
3	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
4	Size
	They are comparatively smaller than 80S  ribosomes	They are comparatively larger than 70S  ribosomes
5	Molecular Weight
	3x106 daltons	4-5x106 daltons
6	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
7	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
8	RNA: Protein
	2:1	1:1

Learn more: 

• Ribosomes
• rRNA Precursor Processing
• How ribosomes are synthesised in the nucleolus?

For more: Cytology Notes