Helper T cells secrete ____, which activate B cells and stimulate their proliferation
a. antigens
b. allergens
c. antibodies
d. interferons
e. interleukins
E
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Visible light has a wavelength range of
A. 400-740 nanometers. B. 200-800 nanometers. C. 200-400 nanometers. D. 200-740 nanometers. E. 0.001-100,000 nanometers.
According to Lamarck, the characteristics of
organisms change because of a. chance. b. an innate drive for perfection. c. extinction of competitors. d. special acts of creation. e. genetic mutation.
Altogether, the body secretes about 7 liters of water into the alimentary canal each day. About what percentage of this water gets reabsorbed?
A) 30% B) 50% C) 60% D) 90%
Which is an example of a disorder in which an individual becomes vulnerable to infection by opportunistic agents that are typically harmless to people in good health?
A. Epstein–Barr B. Severe combined immune deficiency (SCID) C. Multiple sclerosis (MS) D. Muscular dystrophy E. Huntington’s disease