Antiviral drugs against HIV have been developed to do which of the following?
A) inhibit the protease
B) inhibit the reverse transcriptase
C) prevent the virus from entering the host's cells
D) all of the above
D
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Contamination of groundwater by natural and anthropogenic sources of ____ is a global problem that has resulted in hundreds of thousands of premature deaths.
A. arsenic B. cadmium C. lead D. magnesium E. manganese
A sea breeze blows from ___ to ____, and a land breeze blows from ____ to ___ .
a. sea to land; sea to land b. land to sea, sea to land c. sea to land; land to sea d. land to sea; land to sea
Considering the age of the Earth and that the half-life of the isotope uranium-238 (238U) is 4.5 billion years, and assuming no additional 238U was produced after the Earth formed, approximately what fraction is left on Earth?
A. one-third B. none C. eighty percent D. half
When the Moon assumes its characteristic thin crescent shape, the position of the Sun is
A. at right angles to the line between the Moon and Earth. B. almost directly in back of the Moon. C. almost directly behind the Earth, so Earth is between the Sun and the Moon.