Textbook Question
These aerobic, gram-negative bacteria produce tracheal cytotoxin that kills ciliated cells of the trachea.
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7. Prokaryotic Cell Structures & Functions
Gram-Negative Cell Walls
Multiple Choice
In the figure showing different bacterial cell wall structures labeled A, B, and C, which diagram represents a Gram-negative cell wall?
A
C: No peptidoglycan layer, only plasma membrane
B
A: Thin peptidoglycan layer with an outer membrane
C
B: Thick peptidoglycan layer without an outer membrane
Verified step by step guidance1
Recall the key structural differences between Gram-positive and Gram-negative bacterial cell walls. Gram-positive bacteria have a thick peptidoglycan layer and no outer membrane, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane.
Examine the descriptions of the diagrams: Diagram A shows a thin peptidoglycan layer with an outer membrane, Diagram B shows a thick peptidoglycan layer without an outer membrane, and Diagram C shows no peptidoglycan layer, only a plasma membrane.
Match the characteristics of Gram-negative bacteria to the diagrams. Since Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane, identify which diagram fits this description.
Confirm that Diagram A corresponds to the Gram-negative cell wall structure because it has both a thin peptidoglycan layer and an outer membrane, which are hallmark features of Gram-negative bacteria.
Understand that Diagram B represents a Gram-positive cell wall due to its thick peptidoglycan layer and lack of an outer membrane, and Diagram C likely represents a cell without a typical bacterial cell wall, such as a Mycoplasma.
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