Archaebacteria different from eubacteria in

Options

A. Cell membrane
B. Mode of nutrition
C. Cell shape
D. Mode of reproduction

Answer

### Step-by-Step Text Solution

1. **Understanding Archaebacteria and Eubacteria**:
- Archaebacteria and Eubacteria are two distinct groups of prokaryotic organisms classified under the kingdom Monera. They have significant differences in their cellular structure and biochemical processes.

2. **Cell Membrane Composition**:
- The primary difference lies in their cell membranes. Archaebacteria have a unique lipid composition in their membranes, which often includes ether linkages and branched hydrocarbons, making them more stable under extreme conditions. In contrast, Eubacteria have a typical phospholipid bilayer with ester linkages.

3. **Cell Wall Structure**:
- The cell walls of Archaebacteria do not contain peptidoglycan, which is a characteristic component of Eubacterial cell walls. Instead, Archaebacteria may have a cell wall made of proteins or other polymers, which can include unique structures like pseudomurein.

4. **Environmental Adaptations**:
- Archaebacteria are often found in extreme environments such as hot springs, salt lakes, and deep-sea vents, which is a reflection of their unique adaptations. Eubacteria are more commonly found in a variety of environments, including soil, water, and as part of the human microbiome.

5. **Reproduction and Mutation**:
- Both Archaebacteria and Eubacteria reproduce asexually, primarily through binary fission. There is no significant difference in their modes of reproduction. Similarly, the mode of mutation does not vary greatly between the two groups.

6. **Conclusion**:
- The main differences between Archaebacteria and Eubacteria are primarily in their cell membrane composition and cell wall structure. Therefore, the correct answer to the question is that Archaebacteria differ from Eubacteria in their cell membrane composition.