Diameter of cisternae of Golgi apparatus is:

Answer

### Step-by-Step Solution:

1. **Understanding the Golgi Apparatus**:
- The Golgi apparatus is a membrane-bound organelle found in eukaryotic cells. It plays a crucial role in the processing and packaging of proteins and lipids.

2. **Structure of the Golgi Apparatus**:
- The Golgi apparatus consists of a series of flattened membrane-bound sacs known as cisternae. These cisternae are stacked together to form the Golgi apparatus.

3. **Function of the Golgi Apparatus**:
- The primary function of the Golgi apparatus is to modify, sort, and package proteins and lipids that have been synthesized in the endoplasmic reticulum. These substances are then transported to their respective destinations.

4. **Size of the Golgi Apparatus**:
- The entire Golgi apparatus typically measures about 2 to 5 millimeters in size.

5. **Diameter of Cisternae**:
- Specifically, the diameter of the cisternae of the Golgi apparatus ranges from 0.5 to 1 micrometer.

6. **Conclusion**:
- Therefore, the diameter of the cisternae of the Golgi apparatus is approximately 0.5 to 1 micrometer.

### Final Answer:
The diameter of the cisternae of the Golgi apparatus is approximately **0.5 to 1 micrometer**.

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