Which molecules are distinctively different in Bacteria and Archaea?

Question

anonymous · Answer

There's a big difference between Bacteria and Archaea: peptidoglycan. 

Bacteria have a thick cell wall made of a special molecule called "peptidoglycan." 
This peptidoglycan is made of carbohydrates and amino acids. 

Organisms under Archaea don't have peptidoglycan in their cell walls.

anonymous · Answer

the different cell wall stucture is because archaea live in some harsh conditions like extreme salty areas,hot springs,and marshy areas,so they have more stucturally stable cell wall.