Bacterial cell wall is composed of

Options

A. Protein
B. Lipid
C. Non- cellulosic carbohydrate
D. Both (1) and (3)

Answer

**Step-by-Step Solution:**

1. **Understanding the Composition of the Bacterial Cell Wall:**
- The bacterial cell wall is primarily composed of a substance known as peptidoglycan. This is crucial for maintaining the shape and integrity of the bacterial cell.

2. **Defining Peptidoglycan:**
- Peptidoglycan is a polymer that consists of long chains of sugars (oligosaccharides) cross-linked by short peptides (proteins). This unique structure provides strength and rigidity to the cell wall.

3. **Analyzing the Options Given:**
- The first option is "Protein." While proteins are part of the peptidoglycan structure, they are not the sole component.
- The second option is "Lipid." This option is incorrect because lipids are not a major component of the bacterial cell wall.
- The third option is "Non-cellulosic carbohydrate." This option is correct as oligosaccharides are indeed carbohydrates that are part of the peptidoglycan structure.
- The fourth option is "Both first and third." This option is also correct because it includes the correct components of the bacterial cell wall.

4. **Conclusion:**
- The most appropriate answer is option four, as it encompasses both the protein and non-cellulosic carbohydrate components of the bacterial cell wall.

**Final Answer:**
The bacterial cell wall is composed of peptidoglycan, which includes both proteins and non-cellulosic carbohydrates.

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