| 1. | Large parasites such as helminthes may be killed extracellularly by the action of |
| a. | basophils |
| b. | monocytes |
| c. | eosinophils |
| d. | neutrophils |
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Answer: (c).eosinophils
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| 2. | Which of the following is correct for CD8 T cells? |
| 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 |
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Answer: (d).CD8 T cells can kill individual virus-infected cells in a contact dependent fashion
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| 3. | Passive immunization is done for |
| a. | tuberculosis |
| b. | diphtheria |
| c. | enteric fever |
| d. | all of these |
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Answer: (b).diphtheria
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| 4. | Which of the following is correct for isoantigens? |
| a. | They are antigens found in all members of different species |
| b. | They are antigens found in some members of a species |
| c. | They are antigens found in all members of a species |
| d. | They are antigens found in some members of different species |
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Answer: (b).They are antigens found in some members of a species
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| 5. | Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated? |
| a. | By rearrangements of the DNA encoding the variable regions of the heavy and light chains |
| b. | By the combination of different heavy and light chains that form the antigen binding site |
| c. | Antibody proteins can physically change their shape to bind different epitopes |
| d. | Both (a) and (b) |
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Answer: (d).Both (a) and (b)
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