Which of the following bests describes the effort to find a vaccine against HIV?
A) Since the virus is known to mutate rapidly there is no interest in developing a vaccine.
B) There has been considerable research activity, but no clinical trials have been conducted.
C) The clinical trials have been failures.
D) A promising vaccine is currently available.
C
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Which of the following does not describe a neutron?
A. It is more difficult to detect than a proton or an electron. B. It is often associated with protons. C. It is much more massive than an electron. D. It is a nucleon. E. It has a positive charge equivalent but opposite of an electron.
An El Niño causes a reversal in the distribution of atmospheric pressure in what ocean??
A) ?along the equator of the Pacific and Atlantic B) ?between the eastern and western Pacific C) ?the Indian Ocean D) ?between the eastern and western Atlantic
Blood lead levels in children between 1996 and 2012 have
A) increased steadily despite EPA and CDC programs to eliminate lead from the environment. B) continued to decrease as exposure to lead has been reduced. C) remained about the same. D) increased in rural areas but declined in urban areas with heave vehicular traffic.
Which of the following includes most adult fish, marine mammals, marine reptiles, and some marine invertebrates?
A) Animalia B) Benthos C) Nekton D) Plankton E) Plantae