Golgi Apparatus Functions and Characteristics

Modifies, packages, and delivers proteins to their destinations:
- The primary function of the Golgi apparatus is to process protein products synthesized in the endoplasmic reticulum (ER).
- It modifies proteins by adding carbohydrate groups (glycosylation), phosphate groups, and other modifications to prepare them for their final destinations.
- Proteins are packaged into vesicles for transport to various parts of the cell or secretion outside of the cell.

Stores calcium ions for signalling:
- This statement is incorrect as it is the endoplasmic reticulum (particularly the smooth ER) that is primarily involved in calcium ion storage and signalling.
Remains adjacent to the plasma membrane as a rigid barrier:
- This statement is inaccurate. The Golgi apparatus is not a rigid barrier nor is it simply adjacent to the plasma membrane; it is a dynamic structure comprised of flattened membrane-bound sacs, called cisternae, and its positioning within the cell is more central.
Synthesises ribosomal RNA:
- This is also incorrect; ribosomal RNA (rRNA) synthesis occurs in the nucleolus, a sub-structure of the nucleus, and not in the Golgi apparatus.