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Difference between the ribosomes of prokaryotic cells and eukaryotic cells

Features

Prokaryotic Ribosomes

Eukaryotic Ribosomes

Type

70S

80S

Size

Relatively smaller

Relatively larger

Molecular Weight

3 million

4-5 million

Subunits

Small-30S

Large-50S

Small-40S

Large-60S

rRNA in subunit

3 molecules of RNA:

16S RNA in 30S subunit

23S and 5S in 50S subunit

4 molecules of RNA:

18S RNA in 40S subunit

28S, 5S, 5.8S in 60S subunit

Molecular Weight of RNA

16S RNA-5,50,000

23S RNA-11,00,000

5S RNA-40,000

18S RNA-7,00,000

28S RNA-17,00,000

5S RNA-39,000

5.8S RNA-51,000

Number of proteins

21 in small subunit

32-34 in large subunit

30 in small subunit

50 in large subunit

Average Molecular Weight of protein

18,000

21,000

Number of Amino Acids

8,000(approx)

16,000(approx)

RNA:Protein Ratio

2:1

1:2

 

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