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 the Question**: The question asks why archaebacteria are resistant to adverse conditions. This implies that we need to identify a specific structural feature or component that contributes to this resistance.

2. **Analyzing the Options**:
- **Option 1: Peptidoglycan in cell wall**: Peptidoglycan is primarily found in the cell walls of gram-positive bacteria, not archaebacteria. Therefore, this option is incorrect.

- **Option 2: Teichoic acid in cell wall**: Teichoic acids are also associated with gram-positive bacteria and are not found in archaebacteria. Thus, this option is also incorrect.

- **Option 3: Branched chain lipids in the membrane**: This option refers to the unique composition of the membrane lipids in archaebacteria, which consist of branched-chain hydrocarbons. This structural feature is crucial for their survival in extreme environments, making this option likely correct.

- **Option 4: Rhodopsin pigment in membrane**: Rhodopsin is a pigment found in the retina of animals and is not related to the structural features of archaebacteria. Therefore, this option is incorrect.

3. **Conclusion**: After analyzing all the options, the correct answer is **branched chain lipids in the membrane** (Option 3). These lipids provide stability and resistance to extreme conditions such as high temperatures and salinity, which are characteristic of the environments where archaebacteria thrive.

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

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