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(Single Best Answer) Question 171: It is true regarding the normal microbial flora present on the skin and mucous membrane that ?

A) It is absent in the stomach due to acidic pH
B) It establishes in the body only after the neonatal period
C) It cannot be eradicated by antimicrobial agents
D) The flora in the small bronchi is similar to that of the trachea
Answer (Select an option above to get the answer):

(Single Best Answer) Question 172: The serum concentration of which of the following human IgG subclass is maximum ?

A) IgG1
B) IgG2
C) IgG3
D) IgG4
Answer (Select an option above to get the answer):

(Single Best Answer) Question 173: Viruses can be isolated from clinical samples by cultivation in the following except ?

A) Tissue culture
B) Animals
C) Chemically defined media
D) Embryonated eggs
Answer (Select an option above to get the answer):

(Single Best Answer) Question 174: All of the following organisms are known to survive intracellularly except ?

A) Neisseria meningitides
B) Salmonella typhi
C) Streptococcus pyogenes
D) Legionella pneumophila
Answer (Select an option above to get the answer):

(Single Best Answer) Question 175: Virus mediated transfer of host DNA from one cell to another is known as ?

A) Transduction
B) Transformation
C) Transcription
D) Integration
Answer (Select an option above to get the answer):

(Single Best Answer) Question 176: The most common pathogens responsible for nosocomial pneumonias in the ICU are ?

A) Gram positive organisms
B) Gram negative organisms
C) Mycoplasma
D) Virus infections
Answer (Select an option above to get the answer):