Stores and transmits genetic information in the form of dna : site of ribosomal rna synthesis : protein factories of a cell : proteins synthesized on the attached ribosomes enter this organelle and are distributed to other organelles or secreted from the cell : contains enzymes for fatty acid and steroid synthesis; stores and releases ca²⁺ : concentrates, modifies, and sorts proteins arriving from the rough er : membrane-bound vesicular and tubular structures that assist the golgi apparatus with sorting, modifying, and directing vesicular traffic in cells : major site of atp production, o2 utilization, and co2 production : break down bacteria and dead cell debris with acid and a variety of digestive enzymes : removes hydrogen from organic molecules including lipids, alcohol, and potentially toxic ingested substances : may be important for transport of molecules between the cytosol and nucleus and in regulating cell sensitivity to certain drugs : associated with processes that maintain and change cell shape and produce ce