A type of cell termed as a lymphocyte makes proteins which are exported from the cell. You can track the path of these proteins within the cell from production via export by labeling them with radioactive isotopes. Recognize which of the given structures would be radioactively labeled in your experiment, listing them in the order in which they would be labeled: chloroplasts, Golgi apparatus, plasma membrane, smooth ER, rough ER, nucleus and mitochondria.