Multiple Choice
Which of the following best describes a key structural feature of the cell envelope in Gram-positive bacteria?
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7. Prokaryotic Cell Structures & Functions
Gram-Positive Cell Walls
Multiple Choice
Which of the following compounds is commonly found associated with the cell walls of Gram-positive bacteria, but not Gram-negative bacteria?
A
Lipopolysaccharides
B
Porins
C
Outer membrane proteins
D
Teichoic acids
Verified step by step guidance1
Understand the structural differences between Gram-positive and Gram-negative bacteria, focusing on their cell wall composition.
Recall that Gram-positive bacteria have a thick peptidoglycan layer, whereas Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.
Identify that lipopolysaccharides (LPS), porins, and outer membrane proteins are components typically associated with the outer membrane of Gram-negative bacteria.
Recognize that teichoic acids are polymers of glycerol or ribitol phosphate and are embedded within the thick peptidoglycan layer of Gram-positive bacteria, playing roles in cell wall maintenance and ion regulation.
Conclude that teichoic acids are uniquely found in Gram-positive bacterial cell walls and not in Gram-negative bacteria, which lack this thick peptidoglycan layer and associated polymers.
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