Ribosomes
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A ribosome, built of large and small protein-RNA subunits, carries out protein synthesis by translating mRNA into a sequence of amino acids.
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Ribosomes float free in the cytoplasm or attach to the plasma membrane or ER, densest in cells that secrete heavily.
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A ribosome is not membrane-bound — it is a molecular complex, present in prokaryotes and eukaryotes alike.