Final answer:
Most protein sorting in the Golgi apparatus occurs in the trans-Golgi network (TGN), where proteins are modified, tagged, and sorted before delivery to their final destinations.
Step-by-step explanation:
The Golgi apparatus, also known as the Golgi body, plays a crucial role in the sorting, packaging, and distribution of proteins and lipids within the cell.
The most protein sorting occurs in the trans-Golgi network (TGN), which is the last compartment in the Golgi stack.
As proteins move from the cis to the trans face of the Golgi, they are modified, tagged with signal sequences, and then sorted in the TGN before being sent to their final destinations.
Proteins tagged with mannose-6-phosphate, for example, are destined for the lysosomes.