What is the main role of the Golgi apparatus?

• A. Energy production
• B. Modification and packaging of proteins and lipids
• C. DNA replication
• D. Synthesis of ATP

Answer: (B)

The main role of the Golgi apparatus is indeed the modification and packaging of proteins and lipids. This organelle functions as a key site in the cell's processing and sorting pathway. After proteins and lipids are synthesized in the endoplasmic reticulum, they are transported to the Golgi apparatus, where they undergo further modifications, such as the addition of carbohydrate groups in a process known as glycosylation.

Once modified, the Golgi apparatus packages these macromolecules into vesicles, which are then directed to their final destinations—either within the cell or for secretion outside of the cell. This function is essential for ensuring that proteins and lipids are correctly processed and delivered, as improper modifications can lead to dysfunctional cellular components.

In contrast, energy production is primarily carried out by mitochondria, DNA replication occurs in the nucleus, and synthesis of ATP also takes place within mitochondria, emphasizing the specific and distinct roles that different organelles play within the cell.