Both cell wall and cell membrane is different .According to ncert cell wall is different.

Archaebacteria differ from eubacteria in cell wall composition.

Archaebacteria and eubacteria are both types of prokaryotic microorganisms, but they have several differences, including their cell wall composition. The correct answer to the question is option 'A', which states that archaebacteria differ from eubacteria in their cell wall.

Cell wall composition in Archaebacteria:
Archaebacteria have a unique cell wall composition that sets them apart from eubacteria. The cell walls of archaebacteria are made up of various polysaccharides and proteins, such as pseudomurein or S-layer proteins. Pseudomurein is similar to peptidoglycan, which is found in the cell walls of eubacteria, but it has a different structure and composition.

Cell wall composition in Eubacteria:
Eubacteria have a cell wall composed of peptidoglycan, which is a polymer consisting of sugars and amino acids. Peptidoglycan provides structural support to the bacterial cell and helps protect it from osmotic pressure changes. The presence of peptidoglycan in the cell wall is a characteristic feature of eubacteria.

Importance of cell wall composition:
The cell wall composition is an important characteristic that helps differentiate between different groups of bacteria. It plays a crucial role in determining the shape, structure, and function of the bacterial cell. It also influences the bacterial response to environmental conditions, including temperature, pH, and osmotic pressure. The cell wall composition can also impact the susceptibility of bacteria to antibiotics and other antimicrobial agents.

Conclusion:
Archaebacteria and eubacteria differ in various aspects, including their cell wall composition. Archaebacteria have a cell wall composed of polysaccharides and proteins, such as pseudomurein or S-layer proteins, while eubacteria have a cell wall made up of peptidoglycan. Understanding these differences is important in studying and classifying different types of bacteria and their characteristics.