178.A 32-year-old woman has a positive tuberculin skin test, helper T
cells assist in which of the following ways?
a. Autocrine-mediated inhibition of proliferation of helper T cells
b. The downregulation of IL-2 receptors on helper T cells
c. Secretion of interleukins that promote T cell proliferation
d. Secretion of IL-1
e. Inactivation of macrophages by release of γ-interferon
179.A 27-year-old school teacher “catches” the flu from her students.
Which of the following would occur during the influenza infection?
a. Phagocytosis of virus by CD4+T cells
b. Presentation of antigen by CD4+T cells
c. Killing of virus-infected cells by CD4+T cells
d. Formation of memory T and B cells
e. Killing of virus-infected cells by neutrophils
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