The structure you are describing is ribosomes. Ribosomes can either be free-floating in the cytoplasm or attached to the endoplasmic reticulum (ER), particularly the rough endoplasmic reticulum (RER). They are the sites of protein synthesis, where they translate messenger RNA (mRNA) into polypeptide chains, ultimately forming proteins.
floats in the cytoplasm or attached to endoplasmic reticulum and is site of protein synthesis is what?
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