Describe the structure and role of ribosomes in protein biosynthesis.

Ribosomes are complex molecular machines found in all living cells, responsible for protein biosynthesis. They are composed of ribosomal RNA (rRNA) and proteins, with two subunits: the large and the small. In eukaryotic cells, the ribosomes are either free in the cytoplasm or attached to the endoplasmic reticulum, forming the rough ER. In prokaryotes, ribosomes are found freely floating in _________ ______ ________ ________ ______ ____ ______ ______ _________ ______.
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