Archaebacteria was separated from eubacteria by Carl Woese and was given a separate kingdom. They are different from bacteria in :

Options

A. Having photosynthetic forms
B. Lacking branched chain lipids
C. Lacking a peptidoglycan cell wall
D. Having teichoic acids

Answer

**Step-by-Step Solution:**

1. **Understanding the Classification**: Archaebacteria and Eubacteria are two distinct groups of prokaryotic organisms. Carl Woese proposed a classification system that separated Archaebacteria from Eubacteria, leading to the establishment of a separate kingdom for Archaebacteria.

2. **Identifying Key Differences**: To answer the question, we need to identify the key differences between Archaebacteria and Eubacteria. These differences can be found in their cellular structure, composition, and metabolic pathways.

3. **Cell Wall Composition**: One of the most significant differences is in the composition of their cell walls. Eubacteria typically have a cell wall made of peptidoglycan, which is a polymer consisting of sugars and amino acids. In contrast, Archaebacteria have a cell wall that lacks peptidoglycan. Instead, they possess pseudopeptidoglycan or other unique compounds.

4. **Lipid Composition**: Another difference lies in the lipid composition of their cell membranes. Archaebacteria have ether-linked lipids, while Eubacteria have ester-linked lipids. This difference in lipid structure contributes to their resilience in extreme environments.

5. **Conclusion**: Based on the differences identified, we conclude that Archaebacteria are distinct from Eubacteria primarily due to their unique cell wall composition, which lacks peptidoglycan and instead contains pseudopeptidoglycan.

**Final Answer**: Archaebacteria are different from Eubacteria primarily in their cell wall composition, specifically that Archaebacteria have pseudopeptidoglycan instead of peptidoglycan.

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