医学免疫学英语试题

ⅠChoose one which is the best answer in each question（40 × 1 point = 40 ）

1. Immunological unresponsiveness to self antigens is called: ( A)

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 )

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

10. Neutrophils are attracted to an infected area by ( C )

A. IgM

B. C1

C. C5a

D. C8

11. Complement lyses cells by ( C )

A. enzymatic digestion of the cell membrane

B. activation of adenylate cyclase

C. insertion of complement proteins into the cell membrane

D. inhibition of elongation factor 2

12. CD8 is a marker of ( C)

A. B cells

B. Helper - T cells

C. cytotoxic T cell

D. Mφ

13. MHC class Ⅱ molecules are found on (B )

A. Virtually all cells in the body

B. B cells, DC and Mφ

C. Virtually all nucleated cells in the body

D. Only on virally-infected cells.

14. All of following cytokines are secreted by Th2 cells except (B )

A. IL-4

B. IFN-γ

C. IL-5

D. IL-6

15. Which of the following is NOT true of CD4+ and CD8+ cell markers? ( D )

A. These are both surface glycoproteins expressed on T-cells.

B. These serve to distinguish different types of T-cells, e.g., helper, suppressor and cytotoxic, from each other.

C. These are not found associated with immunoglobulins.

D. Both of the markers are present on ALL T-cells.

16. Cells bearing MHC class I plus peptide are targets for specific: ( B )

A B-cells.

B Cytotoxic T-cells.

C Th1 cells.

D Th2 cells.

17. Dendritic cells are characterized by: ( D )

A the presence of major basic protein

B expression of CD3

C expression of IgM molecules

D their interface between the innate and adaptive immune system

18. Which of the following uniquely distinguishes the T-cell receptor (TCR) from an antibody? ( A )

A. The TCR can bind an antigen fragment only in a trimolecular complex with either the class I or class II surface proteins of the major histocompatibility complex

B. The TCR can function as a cell surface antigen receptor

C. The TCR is composed of two different types of polypeptide chains

D. The TCR is capable of participating in a cytotoxic reaction.