A Radioactively Labeled Protein Is Made by Cells and Followed

Multiple Choice

A radioactively labeled protein is made by cells and followed through the various organelles in the secretory pathway. After six hours, all of the radioactivity is still primarily in the Golgi apparatus. This suggests that the

A) protein does not possess a signal peptide for localization within the lumen of the rough endoplasmic reticulum.
B) protein possesses a signal for localization within the Golgi apparatus.
C) secretory vesicles are not fusing with the plasma membrane.
D) protein was not translated by the ribosomes.
E) all of the above