Multiple Choice
When a mosquito infected with Plasmodium first bites a human, the Plasmodium _____.
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7. Prokaryotic Cell Structures & Functions
Introduction to Bacterial Cell Walls
Multiple Choice
Which of the following components is found in the cell wall of Gram-positive bacteria but not in Gram-negative bacteria?
A
Teichoic acids
B
Lipopolysaccharide
C
Periplasmic space
D
Outer membrane
Verified step by step guidance1
Step 1: Understand the structural differences between Gram-positive and Gram-negative bacteria, focusing on their cell wall composition.
Step 2: Recall that Gram-positive bacteria have a thick peptidoglycan layer, which contains unique components such as teichoic acids embedded within it.
Step 3: Recognize that Gram-negative bacteria have a thinner peptidoglycan layer but possess an outer membrane containing lipopolysaccharides (LPS), which are absent in Gram-positive bacteria.
Step 4: Note that the periplasmic space is a feature found in Gram-negative bacteria between the outer membrane and the plasma membrane, but it is not prominent in Gram-positive bacteria.
Step 5: Conclude that teichoic acids are specific to the cell wall of Gram-positive bacteria and are not found in Gram-negative bacteria, distinguishing them from the other listed components.
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