The Endoplasmic Reticulum (ER):Biosynthetic Factory Endoplasmic reticulum (ER): extensive networkof membrane-bounded tubules and sacs;membrane separates lumen from cytosol;continuous with nuclear envelope Two kinds of ER: Smooth ER lacks attached ribosomes. Rough ER lines the outer surface of membranes. Although physically interconnected, smooth andrough ER differ in structure and function.
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