The principal structural component of the cell wall in Gram-positive bacteria is

Explanation

The defining structural feature of a Gram-positive bacterial cell wall is its very thick peptidoglycan layer. Peptidoglycan consists of alternating N-acetylglucosamine and N-acetylmuramic acid chains cross-linked by peptides. Gram-positive walls also contain teichoic acids. Lipopolysaccharide, by contrast, is characteristic of the outer membrane of Gram-negative bacteria.