Multiple Choice
Which cellular mediator is primarily involved in the development of Type I hypersensitivity reactions?
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21. The Immune System
Introduction to the Immune System
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Which of the following is not true of Streptococcus pneumoniae?
A
It is a common cause of pneumonia.
B
It is part of the normal flora of the skin.
C
It can cause meningitis.
D
It is a gram-positive bacterium.
Verified step by step guidance1
Begin by understanding the characteristics of Streptococcus pneumoniae. It is a bacterium known for causing various infections, including pneumonia and meningitis.
Recognize that Streptococcus pneumoniae is classified as a gram-positive bacterium. This means it has a thick peptidoglycan layer in its cell wall, which retains the crystal violet stain used in the Gram staining procedure.
Consider the environments where Streptococcus pneumoniae is typically found. It is not part of the normal flora of the skin; rather, it is commonly found in the respiratory tract.
Review the common diseases associated with Streptococcus pneumoniae. It is a well-known cause of pneumonia and can also lead to meningitis, especially in vulnerable populations.
Identify the statement that is not true based on the information gathered: Streptococcus pneumoniae is not part of the normal flora of the skin.
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