Which immune system component has a principal role in the curve labeled “D” on the graph?
a. IgM
b. IgA
c. cytotoxic T cells
d. memory cells
e. NK cells
D
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Valley fever, a medical condition caused by Coccidioides immitis, is caused by
A. common allergic reactions that many people have to the fungus. B. entry of the fungal spores by inhalation. C. toxins produced by the fungus. D. a mutation of the common fungal inhabitant of human hair, nails, and skin. E. eating the fruiting body, rather than the mycelium of the fungus.
Thomas Malthus proposed that
a. the food supply increased faster than the population. b. the population increased faster than the food supply. c. the food supply and population increased at the same rate. d. artificial selection was the key to evolution. e. natural selection was the key to evolution.
When substrate level phosphorylation occurs, it means what?
A. ATP is converted into ADP plus a phosphate group. B. NADH is converted into NAD + H. C. ADP is converted into ATP by addition of a phosphate group. D. NAD is converted into NADH. E. AMP is converted into NAD by adding a phosphate group.
The HIV virion attaches to ________ on the surface of lymphocytes
A) IgG B) MHC II C) IL-2R D) CD4 E) CD3