Question

A ribosome is the only organelle that is found in both the type of cells, i.e. eukaryotic and prokaryotic cells, as well as in organelles like mitochondria and plastid because

A
It is a non-membrane bound organelle.
B
It is a double membrane-bound organelle.
C
It is present in 70S form in the cytoplasm of a prokaryotic cell while as 80S in an eukaryotic cell.
D
It is present in 70S form in in mitochondria and plastid while as 80S in an eukaryotic cell.

Solution

The correct option is A It is a non-membrane bound organelle.Prokaryotic cells do not have internal membrane-bound organelles within their cytoplasm.Since ribosomes are non-membrane bound organelles, they are present in prokaryotic cells.In the case of eukaryotic cells, although most of the organelles present are membrane-bound, non-membrane bound organelles can also be found, like ribosomes and centrioles.Ribosomes are present in $$70S$$ form in the cytoplasm of a prokaryotic cell and in the organelles like mitochondria and plastid while as $$80S$$ in the cytoplasm of an eukaryotic cell.Although both statements given in options C and D are correct, they do not explain the reason for the ribosome to be present in both prokaryotic as well as eukaryotic cells.So, the correct answer is option A.Biology

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