Ribosomes
of
Chloroplasts - Chloroplasts have a well defined protein synthesis machinery which, in general, resembles that of bacterial cells. Ribosomes have been reported in chloroplasts of a wide variety of plant species.
As a general approximation the chloroplast ribosomes of plant cells have a sedimentation coefficient of 70S as compared to 82S for cytoplasmic ribosomes.
The 70S chloroplast ribosomes are similar in size to bacterial ribosomes, and the 82S plant ribosomes to the cytoribosomes of animal cells.
