Peptidoglycan makes up the cell wall of prokaryotes. Thus option D is correct.
The murein or peptidoglycan the major component of bacterial cell wall, which is a polymer of sugars and amino acids.
A cluster of peptidoglycan molecules are joined together to form a crystal lattice structure in a ordered way.
On the basis of different structure and composition of peptidoglycan make bacteria either gram-positive or gram-negative bacteria.
Two alternating amino sugars N-acetylglucosamine or NAG and N-acetylmuramic acid or NAM are crosslinked with each other to form a crystal orderly structure of peptidoglycan which provide a strong structure to cell wall.
The major function of peptidoglycan include provide a shape and integrity to cell against internal turgor pressure, help in asexual reproduction mainly binary fission, provide protection from external environment.
Thus, option D is correct.
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