For 10 points, name this cellular organelle whose "smooth" and "rough" types are differentiated based on ribosomal presence.
These structures are stacked and connected through helical ramps called Terasaki ramps. Vesicles that move from this organelle to another one are tagged with COPII ("C. O. P. 2") while those that move back carry the COPI ("C. O. P. 1") tag. One type of this structure works in the production of steroid hormones and detoxification. Like the Golgi Apparatus, this (*) organelle is made up of flattened membrane disks called cisternae. The general functions of this organelle include the synthesis and export of lipids and proteins. The membranes of this organelle are continuous with the outer nuclear membrane. For 10 points, name this cellular organelle whose "smooth" and "rough" types are differentiated based on ribosomal presence.
These structures are stacked and connected through helical ramps called Terasaki ramps.
endoplasmic reticulum [accept rough or smooth endoplasmic reticulum] &lt;AP&gt;