Which of the following statements about the endoplasmic reticulum (ER) is false? The ER is the major site for new carbohydrate in the cell. The ER is the major site for new membrane synthesis in the cell. The sarcoplasmic reticulum, which is found in muscle cells, is a specialized region of ER. The ER membrane is contiguous with the outer nuclear membrane. The ER is the major site for new transmembrane protein synthesis in the cell. g