Question

Cell wall of bacteria/cyanobacteria possesses
(a)Chitin
(b)Murein/Mucopeptide
(c)Peptidoglycan and amino sugar
(d)Both b and c

Answer 1

Hint: Its thickness ranging from 20 to 40 nm, usually forms a physical barrier for the dye. It is a defensive layer that encompasses a few cells and gives them shape and unbending nature. It is situated external to the cell wall and forestalls osmotic lysis (blasting gratitude to expanding volume). The chemical composition of the cell wall varies.

Complete step by step answer:
Bacteria and cyanobacteria both are prokaryotic organisms. They both lack true cell organelles. They both possess a nucleoid instead of a true nucleus. Nucleoid may be a genetic material without a nuclear envelope. The cell membrane of bacteria and cyanobacteria is formed from peptidoglycan. Peptidoglycan may be a polymer made from sugars and amino acids. It is also called murein.

So the correct answer to the above question is ‘Both b and c’

Additional information: By and large, proteins have just L-amino acids; as a result, huge numbers of our antimicrobials work by impersonating D-amino acids and in this way effectively affect bacterial cell-wall advancement. There are more than 100 various forms of peptidoglycan. S-layer (surface layer) proteins are additionally present outwardly of the cell wall of both Archaea and Bacteria.

Note:
Up to 90 percent of the cell-wall in Gram-positive bacteria is composed of peptidoglycan, and most of the rest is composed of acidic substances called teichoic acids. Teichoic acids could also be covalently linked to lipids within the cell wall to make lipoteichoic acids. Lipoteichoic acids anchor the cell wall to the cell layer.
In gram-negative bacteria, it has a comparatively thin cell membrane which is composed of a couple of layers of peptidoglycan (only 10 percent of the entire cell wall), surrounded by an outer envelope containing lipopolysaccharides (LPS) and lipoproteins.