Multiple Choice
Which term best describes a small, circumscribed lesion containing pus, often associated with bacterial infections?
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7. Prokaryotic Cell Structures & Functions
Introduction to Bacterial Cell Walls
Multiple Choice
In the figure, which diagram of a bacterial cell wall contains teichoic acids?
A
Diagram B: Thin peptidoglycan layer with outer membrane
B
Diagram A: Thick peptidoglycan layer with teichoic acids
C
Diagram C: No peptidoglycan, only a lipid bilayer
Verified step by step guidance1
Understand the 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.
Recall that teichoic acids are unique components found only in the cell walls of Gram-positive bacteria, where they are embedded within the thick peptidoglycan layer.
Identify that Diagram A, which shows a thick peptidoglycan layer, corresponds to a Gram-positive bacterial cell wall and is the one that contains teichoic acids.
Recognize that Diagram B, with a thin peptidoglycan layer and an outer membrane, represents a Gram-negative bacterial cell wall, which does not contain teichoic acids.
Note that Diagram C, showing no peptidoglycan and only a lipid bilayer, likely represents a different type of membrane structure (such as a mycoplasma) and does not contain teichoic acids.
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