What is the primary function of the Golgi apparatus in a cell?

• A. To produce energy through cellular respiration.
• B. To synthesize ribosomal RNA.
• C. To modify, sort, and package proteins and lipids.
• D. To facilitate DNA replication.

Answer: (C)

The primary function of the Golgi apparatus is to modify, sort, and package proteins and lipids that have been synthesized in the endoplasmic reticulum. Once proteins and lipids are produced in the rough and smooth ER, respectively, they are transported to the Golgi apparatus, where they undergo further modifications, such as glycosylation (addition of carbohydrate groups) and phosphorylation.

After these modifications, the Golgi apparatus sorts these molecules and packages them into vesicles that are directed to their appropriate destinations within or outside the cell. This process is crucial for ensuring that proteins reach their specific locations to perform their intended functions, such as secretion, incorporation into the cell membrane, or delivery to lysosomes.

This role of the Golgi apparatus is fundamental for maintaining cellular organization and function, as it helps regulate the flow of materials necessary for cell metabolism and communication.