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    Radioactive Ribosmal Subunits

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    You prepare radioactivley labelled ribosomal subunits and you microinject them into cells that you are culturing in the laboratory. At different times after you inject the subunits, you take a small amount of cells and analyze them by electron microscopy. You find very soon after injection, the labelled subunits are assembled into cytosolic ribosomes. As more time passes, labelled subunits can be seen in both cytosolic and ER-bound ribosomes. Interpret these observations.

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    Ribosomes are the eukaryotic cell's site for protein synthesis, right? And, where does protein synthesis occur? There are two places: the cytosol (the liquidy, nonmembranous portion of the cytoplasm) and ...