Concept: Cells synthesize dangerous digestive enzymes that could destroy their own architecture if activated prematurely.

Solution: Powerful proteolytic enzymes (like pepsinogen) are secreted in an inactive zymogen form. This prevents them from digesting the cell membrane and internal proteins of the very cell that produced them during transport and exocytosis.

Distractor Autopsy: While DNA and mitochondria are vital, the immediate structure exposed to a secreted enzyme during the exocytosis process is the cell membrane.