Multiple Choice
Upon completion of the Gram stain, Gram-positive cells will appear:
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7. Prokaryotic Cell Structures & Functions
Gram-Positive Cell Walls
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Which of the following components is a major structural feature of Gram-positive bacterial cell walls?
A
Outer membrane containing lipopolysaccharide
B
Thin peptidoglycan layer
C
Thick peptidoglycan layer
D
Periplasmic space with high concentrations of porins
Verified step by step guidance1
Recall the basic structural differences between Gram-positive and Gram-negative bacterial cell walls. Gram-positive bacteria have a thick peptidoglycan layer, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.
Understand that the outer membrane containing lipopolysaccharide (LPS) is characteristic of Gram-negative bacteria, not Gram-positive bacteria.
Recognize that the periplasmic space with high concentrations of porins is also a feature of Gram-negative bacteria, facilitating molecule transport through the outer membrane.
Identify that Gram-positive bacteria lack an outer membrane and instead have a thick, multilayered peptidoglycan structure that provides rigidity and protection.
Conclude that the major structural feature of Gram-positive bacterial cell walls is the thick peptidoglycan layer.
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