Immune System 21-25

Question 1

Jenner observed that milkmaids who were infected with cowpox were later immune to smallpox infections. This is an example of a(n):

Answer 1

memory response to a cross-reactive antigen.

Question 2

Macrophages generally kill the bacteria they phagocytose by fusing lysosomes containing digestive enzymes with the phagocytic vesicle. In the case of pathogens which block this fusion, pathogen killing can still be achieved through the effector function of:

Answer 2

Th1 cells

Question 3

Phagocytosis

Answer 3

can be stimulated by antigen binding to complement or antibody

Question 4

Several friends who went on a picnic together developed vomiting and diarrhea from eating potato salad contaminated with Staphylococcus aureus enterotoxin. Effects of the toxin could best be counteracted by

Answer 4

antibody binding and neutralization of the toxin.

Question 5

Which of the following statements is FALSE?

A. an example of passive humoral immunity is treatment with horse anti-snake venin.
B. antigen recognized by helper T cells must be associated with Class II MHC molecules on the surface of professional APC.
C. each lymphocyte has many antigen binding receptors, each reseptor capable of binding the same antigen.
D. recognition and killing of virus-infected cells by cytotoxic T cells is an example of adaptive immunity.
E. The innate immune system does not deal with endogenous antigen.

Answer 5

E. The innate immune system does not deal with endogenous antigen.