Question

why in eukaryotic mitochondria ribosomes have 70s subunits​ why not 80s​

Answer 1

Answer:

The eukaryotic ribosomes have 70S subunits as they are made up of ribonucleoproteins in the ratio of 60:40 RNA : PROTEIN.

70S ribosomes consist of:

30S smaller subunit - 21 protein molecules and 16 S rRNA.

50S larger subunits - 34 proteins molecules and 23S and 5 S rRNA.

Hope it helps

Answer 2

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Prokaryotes have 70S ribosomes, singly made of a 30S and a 50S subunit. While the Eukaryotes have 80S ribosomes, singly made of a 40S and 60S subunit. 70S Ribosomes are relatively smaller than 80S while the 80S Ribosomes are relatively bigger than 70S ribosomes.

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Hope it helps... ¯\_(ツ)_/¯