The Golgi cisternae are concentrically arranged convex cis or the maturing face.

Options

A. Concave cis or the forming face and convex cis or the maturing face .
B. Concave cis or the forming face and convex trans or the maturing face .
C. Convex trans or the forming face and concave cis or the maturing face.
D. Convex cis or the forming face and concave trans or the maturing face.

Answer

To solve the question regarding the arrangement of Golgi cisternae, we will analyze the properties of the Golgi apparatus and its faces step by step.

### Step-by-Step Solution:

1. **Understanding the Golgi Apparatus**: The Golgi apparatus is an organelle in eukaryotic cells that is involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.

2. **Identifying the Faces**: The Golgi apparatus has two distinct faces:
- **Cis Face**: This is the side of the Golgi apparatus that is oriented towards the endoplasmic reticulum (ER). It is known as the "forming face" because it receives vesicles containing newly synthesized proteins and lipids from the ER.
- **Trans Face**: This is the side that faces away from the ER and is known as the "maturing face." It is where the processed proteins and lipids are sorted and sent to their final destinations.

3. **Shape of the Faces**:
- The **Cis Face** is **convex**, meaning it bulges outward.
- The **Trans Face** is **concave**, meaning it curves inward.

4. **Analyzing the Options**: Now, let’s evaluate the options provided in the question:
- **Option 1**: Concave cis or the forming face and the convex trans or the maturing face. (Incorrect)
- **Option 2**: Concave cis or the forming face and the convex trans or the maturing face. (Incorrect)
- **Option 3**: Convex trans is also wrong because the trans face is concave. (Incorrect)
- **Option 4**: Convex cis or the forming face and the concave trans or the maturing face. (Correct)

5. **Conclusion**: The correct answer is **Option 4**: Convex cis (forming face) and concave trans (maturing face).