医学免疫学英语试题.doc

ⅠChoose one which is the best answer in each question（40 × 1 point = 40 ） 1. Immunological unresponsiveness to self antigens is called: ( A) 窗体顶端 A??Tolerance B??Tolerogen C??Memory D??Acquired immunity 2. The signal transduction molecules associated with BCR are (B )A. CD21 and CD81. B. Igαnd IgβCD79a,b C. IgD and IgM. D.ITAMs and ITIMs. 3. T cells are MHC-restricted in their ability to respond to antigen because (D )A. all antigen must be processed and presented to activate lymphocytes. B. during an infection, all cells in the body present antigen on MHC Class I. C. MHC binds antigen more specifically than TCR does. D. TCR must recognize both antigen and MHC molecules. 4. An antibody Fab contains ( A B)A. complementarity determining regions. B. H and L chain variable regions. C. one antigen binding region. D. one H-L interchain disulfide bond. 5 Positive selection in the thymus is mediated by: ( A ) 窗体顶端 A??Thymic epithelial cells. B??Macrophages. C??Dendritic cells. D??B-cells. 6. Type Ⅳ hypersentivity is often referred to as: ( B ) A. Immediate hypersensitivity B. Delayed hypersensitivity C. Cytotoxic hypersensitivity D. Allergic hypersensitivity 7. Type Ⅱhypersentivity is often referred to as: ( C ) A. Immediate hypersensitivity B. Delayed hypersensitivity C. Cytotoxic hypersensitivity D. Allergic hypersensitivity 8. Naive B cell expresses ( C ) A. IgA alone B.IgA and IgG C IgM +IgD D.IgE and Ig 9. T cell-derived cytokines ( D ) A. are antigen-specific products of T cell activation B. are stored in the resting T cell and released on activation C. are MHC-restricted in their effects D. influence the class of antibodies produced by B cell Neutrophils are attracted to an infected area by ( C ) IgM B. C1 C. C5a D. C8 Complement lyses cells by ( C ) enzymatic digestion of the cell membrane activation of adenylate cyclase insertion of co