Final answer:
Peptidoglycan is composed of alternating sugar molecules called N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). It provides bacterial cell walls with tensile strength.
Step-by-step explanation:
The correct answer is B) Peptidoglycan.
Peptidoglycan is a major component of bacterial cell walls and provides them with tensile strength. It is composed of alternating sugar molecules called N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM). The structure of peptidoglycan consists of long chains of NAG and NAM, cross-linked by peptide bridges, which give the cell wall its strength.
Chitin, which is composed of N-acetylglucosamine units, is another example of a structural polysaccharide found in fungal cell walls and the exoskeletons of insects.