Golgi Apparatus Structure Identification

The Golgi apparatus (also known as the Golgi complex or Golgi body) is a key organelle in eukaryotic cells responsible for modifying, sorting, and packaging proteins and lipids.

Defining Golgi Sacs: Cisternae

The fundamental structural units of the Golgi apparatus are flattened, membrane-enclosed sacs called cisternae. These sacs are typically stacked upon one another, forming a structure often referred to as a Golgi stack.

• A Golgi stack usually consists of multiple cisternae (commonly 3-8).
• The stack exhibits polarity, with distinct cis (receiving) and trans (shipping) faces.

Evaluating Other Cellular Structures

The other options represent different cellular components:

• Cristae: These are the inner folds of the mitochondria, increasing surface area for ATP production.
• Thylakoids: These are membrane-bound compartments within chloroplasts where light-dependent reactions of photosynthesis occur.
• Vesicles: These are small, membrane-bound sacs used for transport within the cell. While the Golgi apparatus forms vesicles, they are not the main stacked structures themselves.

Therefore, the specific name for the flat, stacked sacs comprising the Golgi apparatus is cisternae.