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Nucleus: Double membrane with pores → controls what goes in/out for protein production. Cell Membrane: Semi-permeable → lets good stuff in, waste out. Rough ER: Ribosomes on surface → makes proteins efficiently. Golgi Body: Stacked sacs → sort and send proteins/lipids easily. Mitochondria: Folded inner membrane → more surface for energy production. Vacuole: Membrane sac → stores stuff safely and moves it around the cell.