Free dimers of hydroxycinnamates, lignans, play important roles in plant defence. Some gram positive bacteria e.g.Phenolic cross-links and phenolic inter-unit linkages result from the oxidative coupling of two hydroxycinnamates or two molecules of tyrosine. 2-Polysachharides –Teichoic acids- polymer of glycerol and ribitol phosphates. Gram-positive cell wall :- Gram-positive bacteria cell wall consisting of many layers plasma membrane, cell wall sometimes capsule 1- Peptidoglycan-Thicker (20 to 80 nanometers) forms around 90% of the dry weight of Gram-positive bacteria. On the based structure of the cell wall and to their response to stain, bacteria have been classified into Gram-positive and Gram-negative.This is notably expressed through the classification into Gram positive and Gram negative bacteria. intracellular parasites such as Mycoplasma ) contain peptidoglycan, not all cell walls have the same overall structures. While all bacterial cell walls (with a few exceptions e.g. It is relatively porous and is not considered to be a permeability barrier for small substrates.
Peptidoglycan is responsible for the rigidity of the bacterial cell wall and for the determination of cell shape. The bacterial cell wall differs from another organisms by the presence of peptidoglycan, which is located immediately outside of the cytoplasmic membrane. Functions The bacterial cell wall provides structural integrity to the cell.
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