The Golgi apparatus receives vesicles from the Rough ER and primarily functions to ...

• A. Modify and package proteins for delivery to lysosomes, membranes, or secretion
• B. Break down glucose
• C. Synthesize DNA
• D. Store nucleotides

Answer: (A)

The Golgi apparatus acts as the cell’s processing and shipping center for proteins and lipids made in the Rough ER. It receives vesicles from the Rough ER, then modifies them (such as adding carbohydrate groups and other tags), sorts them, and packages them into new vesicles for delivery to their final destinations—lysosomes, the plasma membrane, or for secretion outside the cell. This processing step is what makes proteins usable and correctly targeted after their synthesis.

This isn’t where glucose is broken down (that happens in glycolysis in the cytosol and mitochondria), nor is it where DNA is synthesized (that occurs in the nucleus), nor where nucleotides are stored (nucleotide storage is not a function of the Golgi).