Split and merge into it. Answered by The Community. Making the world better, one answer at a time. Proteins synthesized on ribosomes attached to the. endoplasmic reticulum are exported from the cell, whereas proteins synthesized on ribosomes that. are free in the cytosol are used inside the cell.ndoplasmic Reticulum (ER) prepares proteins for cell exports. 4 people found this useful. Edit. Share to: 1  The Five Major Parts of the Brain At its most basic, the brain controls the body. 2  Electrical impulses are sent along the nervous system to and from the brain that regulate all movement.