Answer :

The scientist track the radiolabelled sugars which are attached to the proteins within the golgi appratus.

Golgi apparatus is an membrane bound organelle found in eukaryotes. It is made up of flattened, stacked pouches called as cisternae. Proteins and lipids are moved, altered, and packaged into vesicles by the Golgi apparatus and delivered to specific locations. It is situated close to the cell nucleus and the endoplasmic reticulum in the cytoplasm.

In an experiment to determine the route secreted proteins follow, radioactively labelled amino acids are added to a growing culture of cells involved in protein synthesis. The secretory vesicles received the radiolabeled proteins from the Golgi apparatus, which then moved there and joined with the plasma membrane to release them outside the cell.

To learn more about golgi apparatus, refer this link.

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