Is ribosome an organelle? How do they differ in prokaryotes and eukaryotes?
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The answer depends on your way of defining an organelle.
If you define it as an organelle irrespective of membrane-enclosed compartment forming a cell, you would have to reply that ribosome is not an organelles.
Otherwise, if you use a much broader definition related to any structure within the cell which plays a remarkable and important role, you would term ribosome as organelles.
However, former definition is preferred as organelle considered as a membrane-enclosed compartment.
If you define it as an organelle irrespective of membrane-enclosed compartment forming a cell, you would have to reply that ribosome is not an organelles.
Otherwise, if you use a much broader definition related to any structure within the cell which plays a remarkable and important role, you would term ribosome as organelles.
However, former definition is preferred as organelle considered as a membrane-enclosed compartment.
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Eukaryotic ribosomes are larger. They consist of a 60S large subunit and a 40S small subunit, which come together to form an 80S particle having a mass of 4200 kd, compared with 2700 kd for the prokaryotic 70S ribosome. The 40S subunit contains an 18S RNA that is homologous to the prokaryotic 16S RNA.
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