Which of the following is not the characteristic of Archaebacteria

Options

A. They are most primitive monerans
B. Cell wall contains pseudomurein
C. Can toletate adverse conditions
D. Presence of peptidoglycan

Answer

To determine which of the following is not a characteristic of Archaebacteria, we need to analyze the characteristics of Archaebacteria based on the information provided:

### Step-by-Step Solution:

1. **Understanding Archaebacteria**:
- Archaebacteria are unicellular prokaryotic organisms. This means they consist of a single cell and lack a nucleus.

2. **Extreme Habitats**:
- Archaebacteria are known to thrive in extreme environments, such as high salt concentrations (halophiles), extreme temperatures (thermophiles), and marshy areas (methanogens).

3. **Cell Wall Composition**:
- Unlike typical bacteria, Archaebacteria do not have a peptidoglycan layer in their cell walls. Instead, they may contain a unique structure called pseudomurein.

4. **Characteristics of Archaebacteria**:
- They are the oldest living organisms.
- They can tolerate adverse conditions due to their adaptations to extreme environments.
- They do not possess a peptidoglycan layer.

5. **Analyzing Options**:
- Based on the characteristics outlined, we can evaluate the provided options:
- Option 1: "Most primitive monerans" - This is true for Archaebacteria.
- Option 2: "Cell wall contains pseudomurine" - This is also true.
- Option 3: "Can tolerate adverse conditions" - This is true as they live in extreme habitats.
- Option 4: "Presence of Peptidoglycan layer" - This is false, as Archaebacteria do not have a peptidoglycan layer.

6. **Conclusion**:
- The characteristic that is NOT true for Archaebacteria is the "Presence of Peptidoglycan layer".

### Final Answer:
The characteristic that is not true for Archaebacteria is the "Presence of Peptidoglycan layer".

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