DR+specific+immune+HW

Specific Immunity

1. B cells and T cells have antigen receptors on their surface. What is an antigen receptor? (p. 130) Plasma membrane receptor proteins, whose shape allows them to combine with particular antigens

2. If the antigen is the key, what is the lock? (p.130) Antibodies

3. How many types of antigen receptors does one T cell or B cell have? (p. 130) They each only have one type of receptor

4. How many different types of B cells and T cells do we need? Why? (p. 130) We need a diversity because we encounter so many antigens in our lifetime.

5. How many different types of B cell and T cells do we have? (p. 130) We have 5 different types

6. What is the special name for the antigen receptor on a B cell? (p. 131) It is called a B-cell receptor

7. If an antigen and a B-cell receptor make a lock and key match, what does the B-cell do? (p. 131) It binds to the BCR of only one type B cell

8. What does clonal expansion of the B-cells mean? When does this occur? (p. 131) Cytokineses secreted by helper t cells stimulate B cells to clone

9. What are plasma cells? (p. 131) Cells that circulate the blood and lymph

10. What is an antibody with respect to the B-cell receptor? (p.131) Antibody mediated immunity

11. What are memory cells? (p. 131) They are cells that are ready to kill in the future

12. Why is B-cell defense called antibody mediated defense? (p.131) because activated B cells become plasma cells that produce antibodies

13. How do antibodies fight infection? (p.132)

14. What is the name for the antigen receptor on a T-cell? (p. 134) T cell receptor 15. T cell receptors cannot recognize antigen alone, the antigen must be attached to a self protein on a self cell. This protein is called the... (p. 134) Antigen-presenting cell

16. If the T cell lock matches an antigen key, what happens to the T cell? (p. 134) APCs travel to a lymph node or spleen, where T cells also congregate

17. What do cytotoxic T cells do to cells that have antigens that match their T-cell receptor? (p. 135) They go behind enemy lines and seek out a specific enemy

18. How do helper T-cells indirectly fight disease? (p. 135) The do not fight directly, instead they secrete cytokines

19. Which of pertain(s) to B cells? a. have specific receptors b. are responsible for antibody mediated immunity c. synthesize and liberate antibodies

20. Which of these pertain(s) to cytotoxic-T cells? a. have specific receptors b. are more than one type c. are responsible for cell-mediated immunity d. stimulate antibody production by B-cells