The rigid layer that is present in the cell walls of Bacteria that is primarily responsible for the strength of the wall is known as
A) pseudomurein.
B) S-layer.
C) cellulose.
D) peptidoglycan.

Question

Quizplus · Accepted Answer

The rigid layer present in the cell walls of Bacteria that is primarily responsible for the strength of the wall is peptidoglycan. Peptidoglycan is made up of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) sugars cross-linked by short peptide chains. This layer provides bacterial cells with mechanical stability and shape, as well as protection against osmotic pressure. Pseudomurein is present in the cell walls of some Archaea, while the S-layer is a protein layer that may or may not be present on the outer surface of the cell walls. Cellulose is a polysaccharide found in the cell walls of plants, algae, and some bacteria, but not in all Bacteria.

The Rigid Layer That Is Present in the Cell Walls