Final answer:
Bacterial cell walls are composed of peptidoglycan, a complex polysaccharide made up of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). Peptidoglycan provides structural support and protection to bacteria.
Step-by-step explanation:
Bacterial cell walls are composed of peptidoglycan, which is a complex polysaccharide. Peptidoglycan is made up of two types of sugar molecules, N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). These sugar molecules are structurally similar to glucose. Peptidoglycan provides bacteria with structural support and protection.