Identify the cell organelle on the basis of given features.
a. Usually found near the nucleus
b. It has two faces, one convex and other concave
c. Site of post translational of proteins

Options

A. Leucoplast
B. Golgi complex
C. Endoplasmic reticulam
D. Ribosome

Answer

To identify the cell organelle based on the given features, we will analyze each feature step by step:

### Step 1: Analyze the first feature
- **Feature**: Usually found near the nucleus.
- **Explanation**: The Golgi apparatus is typically located close to the nucleus in the cell. This is important because it receives proteins and lipids from the endoplasmic reticulum (ER), which is also located near the nucleus.

**Hint**: Consider which organelles are typically found in proximity to the nucleus.

### Step 2: Analyze the second feature
- **Feature**: It has two faces, one convex and the other concave.
- **Explanation**: The Golgi apparatus consists of flattened, disc-shaped sacs called cisternae. The side facing the ER is known as the cis face (convex), while the side facing the plasma membrane is known as the trans face (concave). This structural feature is crucial for its function in processing and packaging proteins.

**Hint**: Think about the structure of the organelle and how its shape relates to its function.

### Step 3: Analyze the third feature
- **Feature**: Site of post-translational modification of proteins.
- **Explanation**: The Golgi apparatus is responsible for modifying proteins after they have been synthesized in the ribosomes. This includes processes such as glycosylation, phosphorylation, and other modifications that are essential for the proteins to function properly.

**Hint**: Recall the role of organelles in protein processing and which ones are involved in modifications after synthesis.

### Conclusion
Based on the analysis of the three features:
- The organelle that fits all the criteria is the **Golgi apparatus** (or Golgi body). It is located near the nucleus, has a distinct structure with convex and concave faces, and is the site of post-translational modifications of proteins.

**Final Answer**: Golgi apparatus