Cell wall of bacterium is formed of:

Options

A. Cellulose
B. Hemicellulose.
C. Lignin
D. Peptidoglycan

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks about the composition of the cell wall of a bacterium.

**Hint:** Identify the main components that typically make up bacterial cell walls.

2. **Analyzing the Options:**
- **Option 1: Cellulose**
- Cellulose is a polysaccharide made of beta-linked D-glucose. It is primarily found in the cell walls of plants, not bacteria.

**Hint:** Recall that cellulose is associated with plant cells.

- **Option 2: Hamicellulose**
- Hamicellulose is a type of polysaccharide that contributes to the secondary cell wall of plants. It is not relevant to bacterial cell walls.

**Hint:** Consider the role of hamicellulose in plant cells.

- **Option 3: Lignin**
- Lignin is an organic polymer found in the cell walls of plants, providing rigidity and strength. It does not form the cell wall of bacteria.

**Hint:** Remember that lignin is specific to plant cell walls.

- **Option 4: Peptidoglycan**
- Peptidoglycan is a polymer consisting of sugars and amino acids. It forms a mesh-like structure that provides strength and rigidity to the bacterial cell wall. It is also known as murine.

**Hint:** Think about the unique components that are characteristic of bacterial cell walls.

3. **Conclusion:**
The cell wall of a bacterium is primarily formed of **Peptidoglycan**.

**Final Answer:** Peptidoglycan