The group of bacteria devoid of peptidoglycan in its wall is

Options

A. Archaebacteria
B. Cyanobacteria
C. Eubacteria
D. Nostocales

Answer

To answer the question, "The group of bacteria devoid of peptidoglycan in its wall is," we can follow these steps:

### Step 1: Understand the Structure of Bacterial Cell Walls
- Bacterial cell walls are primarily composed of peptidoglycan, which is a polymer made up of sugars and amino acids. This structure is essential for maintaining the shape and integrity of the bacteria.

### Step 2: Identify the Types of Bacteria
- There are different groups of bacteria, including:
- **Eubacteria**: These typically have peptidoglycan in their cell walls.
- **Cyanobacteria**: These are a type of eubacteria that also possess peptidoglycan.
- **Archaebacteria**: This group is distinct from eubacteria and often found in extreme environments.

### Step 3: Analyze the Cell Wall Composition of Archaebacteria
- Archaebacteria are unique in that they do not contain peptidoglycan in their cell walls. Instead, their cell walls are composed of other substances, such as polysaccharides, specifically a compound known as pseudomurein.

### Step 4: Compare with Other Options
- Since eubacteria and cyanobacteria both have peptidoglycan in their cell walls, they cannot be the correct answer. Therefore, the only group that lacks peptidoglycan is Archaebacteria.

### Conclusion
- The group of bacteria devoid of peptidoglycan in its wall is **Archaebacteria**.

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