NURSING ANM AND GNM

NURSING EXAM QUESTIONS

MICROBIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Bacteria are:
A
Prokaryotes with peptidoglycan cell walls
B
Eukaryotes with peptidoglycan cell walls
C
Prokaryotes with chitin cell walls
D
Prokaryotes who live in extreme environments (no peptidoglycan)
Explanation: 

Detailed explanation-1: -Prokaryotic cell walls may be composed of peptidoglycan (bacteria) or pseudopeptidoglycan (archaea). Gram-positive bacterial cells are characterized by a thick peptidoglycan layer. Gram-negative bacterial cells are characterized by a thin peptidoglycan layer surrounded by an outer membrane.

Detailed explanation-2: -Prokaryotes with peptidoglycan in cell wall are called Bacteria.

Detailed explanation-3: -Gram-negative bacteria are surrounded by a thin peptidoglycan cell wall, which itself is surrounded by an outer membrane containing lipopolysaccharide. Gram-positive bacteria lack an outer membrane but are surrounded by layers of peptidoglycan many times thicker than is found in the Gram-negatives.

Detailed explanation-4: -The peptidoglycan (PG), as the exoskeleton of most prokaryotes, maintains a defined shape and ensures cell integrity against the high internal turgor pressure.

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