3932946
Question 1
Question
One of the signals required in the isotype switch of antibodys is:
Answer
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A)Binding of CD40L on t cells with CD40 on b cells
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B) Binding of ICAM-1 with LFA-1
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C) Binding of B7 with CD28
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D) Non of the above
Question 2
Question
Which of the following Abs increases with intrauterine infection?
Answer
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A) IgG
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B) IgM
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C) IgE
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D) IgD
Question 3
Question
Secretory portion of IgA is synthesized by :
Answer
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A) epithelial cells
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B) submucosal plasma cells
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C) A & B
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D) Non of the above
Question 4
Question
Which of the following stabilizes C3 convertase in the alternative pathway of complement activation:
Answer
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A) Properdin
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B) Protectin
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C) Decay acceleration factor
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D) all of the above
Question 5
Question
C3b receptor is found on the following cells except:
Answer
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A) MQ
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B) B cell
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C) Neutrophils
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D) non of the above
Question 6
Question
Obligate fermenters are:
Answer
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A) Obligate anaerobes
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B)Facultative anaerobes
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C) Microaerophils
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D) Aerotolerant anaerobes
Question 7
Question
Bacilli can form endospores in which of the following phases?
Answer
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A) Stationary phase
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B) Lag phase
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C) Exponential phase
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D) Decline phase
Question 8
Question
Which of the following is an acidophilic bacterium?
Answer
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A) Vibrio cholera
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B) Lactobacillus
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C) Mycoplasma
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D) Neisseria
Question 9
Question
Plasmids can be integrated into chromosomes forming:
Answer
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A) Episomes
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B) Mesosomes
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C) Prophage
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D) Bacteriophage
Question 10
Question
Which of the following substances kill same or closely related species of bacteria?
Answer
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A) Colicin
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B) Antibiotics
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C) A &B
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D) Enterotoxin
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