The binding immunoglobuli
The binding immunoglobulin protein or BiP is located in this organelle. Proteins are kept in this organelle by the KDEL retention sequence. One variety of this organelle contains the protein calsequestrin and releases calcium to cause muscle contraction. This organelle functions in the N-glycosylation of molecules and detoxification. It also contains chaperone proteins, which aid in the folding of newly created proteins, which are sent to the Golgi body. For 10 points, name this organelle that comes in "smooth" and ribosome-rich "rough" varieties.
The binding immunoglobulin protein or BiP is located in this organelle.
endoplasmic reticulum [or ER]