Peptidoglycan is characteristic constituent of cell wall in

a) eubacteria

b) archaebacteria

c) bacteria and cyanobacteria

d) monera and protista

e) All of these

Ans: bacteria and cyanobacteria

The eubacteria are the commonly encountered bacteria in soil, water and living in or on larger organisms, and include the Gram-positive and Gram-negative bacteria, and Cyanobacteria (Photosynthetic blue-green algae)
Cyanobacteria contain peptidoglycan or murein in their cell wall.
The archaebacteria grow in unusual environments such as salts brines, hot springs and in the ocean depths, and include the sulfur bacteria, and the methanogens. Archaebacteria lack peptidoglycan
For more about, refer our post Bacterial Cell wall