Immune System problems
- 1. Passive immunization is done for
Options- A. tuberculosis
- B. diphtheria
- C. enteric fever
- D. all of these Discuss
Correct Answer: diphtheria
- 2. The role of the M cell is to
Options- A. trap virus in mucus and prevent entry
- B. induce apoptosis in virus-infected small intestinal epithelia cells
- C. pass bacteria or virus to underlying macrophages for processing and presentation of antigen
- D. they use their cilia to propel mucus out of the small intestine Discuss
Correct Answer: pass bacteria or virus to underlying macrophages for processing and presentation of antigen
- 3. Immunity is not long lasting to
Options- A. influenza
- B. whooping cough
- C. diphtheria
- D. mumps Discuss
Correct Answer: influenza
- 4. Following are the defenses of the colon except
Options- A. sIgA
- B. fast flow rate
- C. dense resident microbiota
- D. mucus Discuss
Correct Answer: fast flow rate
- 5. Which of the following is correct?
Options- A. All T Cells are CD4+
- B. An epitope can have multiple antigens
- C. T Cell receptors are generated by random assortment of gene cassettes
- D. MHC Class II molecules are generated by random assortment of gene cassettes Discuss
Correct Answer: T Cell receptors are generated by random assortment of gene cassettes
- 6. Treatment with bacterial endotoxins results blast formation in
Options- A. B cells
- B. T cells
- C. monocytes
- D. none of these Discuss
Correct Answer: B cells
- 7. T cell receptors (or TCR) on CD4+ T cells
Options- A. recognize peptides not associated with MHC molecules
- B. recognize peptides associated with MHC class I molecules
- C. recognize peptides associated with MHC class II molecules
- D. are secreted out into the environment to bind antigens Discuss
Correct Answer: recognize peptides associated with MHC class II molecules
- 8. Which of the following is correct for CD8 T cells?
Options- A. CD8 T cells only recognize virus-infected cells
- B. CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells
- C. In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only
- D. CD8 T cells can kill individual virus-infected cells in a contact dependent fashion Discuss
Correct Answer: CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
- 9. Large parasites such as helminthes may be killed extracellularly by the action of
Options- A. basophils
- B. monocytes
- C. eosinophils
- D. neutrophils Discuss
Correct Answer: eosinophils
- 10. Which is not an antigen-presenting cell (or APC)?
Options- A. B cell
- B. Polymorphonuclear leukocyte (or PMN)
- C. Dendritic cell
- D. All of the above Discuss
Correct Answer: Polymorphonuclear leukocyte (or PMN)
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