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ribosomes. consists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.onsists of 2 subunits-made of rna and protein function-site of protein synthesis a cell organelle that functions as the site of protein synthesis inthe cytoplasm. its rna components are constructed in the nucleolus.
1 one set for those proteins synthesized by ribosomes that remain suspended in the cytosol, and. 2  a second set for proteins synthesized by ribosomes that are attached to the membranes of the endoplasmic reticulum (ER) forming rough endoplasmic reticulum (RER).