Final answer:
The most radioactivity would be found in the Golgi apparatus.
Step-by-step explanation:
The function of the second protein as protein processing and packaging suggests that the most radioactivity would be found in the Golgi apparatus. The endomembrane system, which includes the Golgi apparatus, processes and ships proteins specified by the nucleus. After synthesis, proteins are modified and packaged in the Golgi apparatus before being distributed to their final destinations. Therefore, the Golgi apparatus is the most likely site to find radioactivity in this case.