No. NAM ( N-acetylmuramic acid ) is absent in the cell wall of archebacteria.

Archebacteria Cell Wall Composition
Archebacteria, also known as archaea, are prokaryotic organisms that have unique cell wall compositions compared to bacteria. Their cell walls lack peptidoglycan, a key component in bacterial cell walls, which contains the sugar derivative, muramic acid.

Absence of Muramic Acid
Archebacteria do not contain muramic acid in their cell walls. Instead, their cell walls are composed of different molecules such as pseudopeptidoglycan or proteins. This unique composition is one of the factors that distinguish archaea from bacteria.

Pseudopeptidoglycan in Archebacteria
Archebacteria cell walls may contain pseudopeptidoglycan, a structure similar to peptidoglycan but with different chemical bonds. Pseudopeptidoglycan does not contain muramic acid, which further supports the absence of this compound in archaeal cell walls.

Function of Cell Wall in Archebacteria
The cell wall of archebacteria plays a crucial role in providing structural support and protection to the cell. While it differs in composition from bacterial cell walls, it serves similar functions in maintaining cell shape and integrity.

Conclusion
In summary, the cell wall of archebacteria does not contain muramic acid, a characteristic sugar derivative found in bacterial peptidoglycan. Instead, archaeal cell walls may consist of pseudopeptidoglycan or proteins, which contribute to their unique structure and properties.