Which of the following describes the main function of the Golgi apparatus?

The main function of the Golgi apparatus is the modification, sorting, and packaging of proteins and lipids. This organelle operates in eukaryotic cells, receiving proteins and lipids synthesized in the endoplasmic reticulum. Once received, the Golgi apparatus modifies these molecules through processes such as glycosylation and phosphorylation, which can alter their function and destination.

After modification, the Golgi apparatus sorts these molecules based on their final destinations—whether they need to be sent to lysosomes, secreted outside the cell, or incorporated into the cell membrane. Once sorted, proteins and lipids are packaged into vesicles that transport them to their designated locations within or outside of the cell. This crucial role in directing and processing cellular products makes the Golgi apparatus essential for maintaining cellular organization and function.

The other choices pertain to different cellular processes. The first option relates to ribosomal RNA synthesis, which occurs in the nucleolus within the nucleus. Storage of genetic information is associated with the nucleus, where DNA is housed. The production of ATP, the energy currency of the cell, occurs predominantly in the mitochondria.