One of the signals required in the isotype switch of antibodys is:

A)Binding of CD40L on t cells with CD40 on b cells

B) Binding of ICAM-1 with LFA-1

Quiz

immunology+bacterial genetics and growth

atbaa2020 10 Fragen

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