Precursors to S·R·E·B·P·s are found on this structure, where they are bound to S·C·A·P. Stress in this structure causes cleavage (-5[1])of A·T·F·6. This structure produces membrane lipids such as phospha·tidyl·choline and is responsible for the synthesis (-5[1])of cholesterol. Stress in this structure induces U·P·R, which degrades misfolded proteins. This structure stores calcium ions, and (10[1])is the origin (10[2])of vesicles (10[1])that transport proteins (10[1]-5[1])to the Golgi body. (10[2]-5[1])One subtype of this structure (10[1])contains ribosomes (10[1])embedded (10[1])into its surface. (10[1])For 10 points, name this organelle that surrounds the nucleus, divided into smooth and rough types. (10[1])■END■ (10[1])