Answer: Formation of peptide bonds
Step-by-step explanation:
The structure of peptidoglycan layer found in the cell wall of bacteria consists of linear polymer chains of two alternating amino sugars that are crossed linked by peptide bond. .
The sheet is formed from the cross linkages of the alternating amino-glycan chains by peptide linkages. Hence the word peptidoglycan.
The two amino sugars are N-acetylglucosamine and N-acetylmuramic acid and are linked covalently by β-1,4-glycosidic bond.
Answer is a each strands are joined by peptide bonds.