Textbook Question
This anaerobic, gram-positive rod is found on the skin. Infections are often treated with retinoids or benzoyl peroxide.
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7. Prokaryotic Cell Structures & Functions
Gram-Positive Cell Walls
Multiple Choice
All of the following are found in the cell walls of Gram-positive bacteria except __________.
A
peptidoglycan
B
teichoic acids
C
lipoteichoic acids
D
lipopolysaccharide
Verified step by step guidance1
Step 1: Understand the structure of Gram-positive bacterial cell walls. Gram-positive bacteria have a thick peptidoglycan layer which provides structural support and shape.
Step 2: Identify the components typically found in Gram-positive cell walls. These include peptidoglycan, teichoic acids, and lipoteichoic acids, which are embedded within or attached to the peptidoglycan layer.
Step 3: Recognize that lipopolysaccharide (LPS) is a major component of the outer membrane of Gram-negative bacteria, not Gram-positive bacteria.
Step 4: Compare the options given and note that peptidoglycan, teichoic acids, and lipoteichoic acids are all characteristic of Gram-positive bacteria, while lipopolysaccharide is absent in their cell walls.
Step 5: Conclude that the correct answer is lipopolysaccharide, as it is not found in the cell walls of Gram-positive bacteria.
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