The archaebacteria are resistant to adverse condition because of the presence of :

Options

A. Peptidoglycan in cell wall
B. Teichoic acids in cell wall
C. Branched chain lipids in membranes
D. Rhodospin pigment in membrane

Answer

**Step-by-Step Solution:**

1. **Understanding Archaebacteria**: Archaebacteria are a group of microorganisms that are distinct from bacteria and eukaryotes. They are known for their ability to survive in extreme environments.

2. **Identifying the Key Feature**: The question asks why archaebacteria are resistant to adverse conditions. The key feature that contributes to their resilience is found in their cell membrane structure.

3. **Analyzing the Options**: The options provided include:
- Peptidoglycan in the cell wall
- Teichoic acid in the cell wall
- Branched chain lipids in membranes
- Rhodopsin pigment in membranes

4. **Evaluating Each Option**:
- **Peptidoglycan**: This is primarily found in the cell walls of gram-positive bacteria and does not contribute to the resilience of archaebacteria.
- **Teichoic Acid**: This is also associated with gram-positive bacteria and is not present in archaebacteria.
- **Branched Chain Lipids**: The correct answer. Archaebacteria have unique branched hydrocarbon chains in their membranes, which are connected by ether linkages. This structure helps them withstand extreme temperatures and acidity.
- **Rhodopsin Pigment**: This pigment is found in the retinal cells of animals and is not related to the structural integrity of archaebacterial membranes.

5. **Conclusion**: The presence of branched chain lipids in the membranes of archaebacteria is what allows them to be resistant to adverse conditions.

**Final Answer**: The archaebacteria are resistant to adverse conditions because of the presence of branched chain lipids in membranes.

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