Choose the phrase that best describes T helper 1 (TH1) cells.
A. Possess a CD25 cell surface receptor
B. Drive B cell proliferation
C. Activate phagocytic cells resulting in delayed hypersensitivity reactions
D. Destroy foreign target cells
C. Activate phagocytic cells resulting in delayed hypersensitivity reactions
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In summer, a __________ prevents upper and lower
waters from mixing. Fill in the blank(s) with the appropriate word(s).
Mary died suddenly of an aortic aneurysm (the sudden bursting of one of the body's largest blood vessels). Which of the following conditions should her children worry most about?
A) hemophilia B) Turner syndrome C) Marfan syndrome D) albinism
Fertilization produces
A. eggs. B. zygotes. C. haploid cells. D. gametes.
The most complete listing of the organisms the H5N1 strain of influenza virus can infect is ____.
A. humans B. pigs C. birds D. humans and pigs E. humans, pigs and birds