NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Bacteria cell walls are made out of
A
peptidoglycan
B
chitin
C
cellulose
D
keratin
Explanation: 

Detailed explanation-1: -The vast majority of the domain Bacteria have a rigid cell wall composed of peptidoglycan. The peptidoglycan cell wall surrounds the cytoplasmic membrane and prevents osmotic lysis. Peptidoglycan is composed of interlocking chains of building blocks called peptidoglycan monomers.

Detailed explanation-2: -The cell wall consists mainly of peptidoglycan (PG), a mesh of polysaccharide strands (composed of a poly-[N-acetylglucosamine (GlcNAc)-N-acetylmuramic acid (MurNAc)] backbone) cross-linked via short peptide bridges attached to the MurNAc residues (Vollmer et al., 2008a).

Detailed explanation-3: -Peptidoglycan is a rigid envelope surrounding the cytoplasmic membrane of most bacterial species. It helps protect bacterial cells from environmental stress and helps preserve cell morphology throughout their life cycle. Peptidoglycan biosynthesis is also an important regulator of bacterial cell division.

Detailed explanation-4: -The cell wall of most bacteria is made of a polymer called peptidoglycan, which is made of sugars and amino acids.

There is 1 question to complete.