Wind-induced surface currents are measured with __________
a) chemical tracers
b) water properties
c) satellites
d) submerged floats
C
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Consider a certain carboxylic acid at physiological pH of about 7.4. Assume the following general reaction. HA(aq) + H2O(l) ? H3O+(aq) + A-(aq) What will happen to the ratio of the deprotonated to protonated form, respectively, if the pH of the solution drops to 6.2?
A) It will decrease. B) It will increase. C) It will remain constant. D) It will decrease then increase since it is a buffer.
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
World food production has doubled in the last 40 years because of
A. genetic modifications, DNA fingerprinting, and international treaties. B. organic farming practices, erosion control, and farm labor. C. diseases, world trade, and new sources of water. D. fertilizers, pesticides, and high-yielding varieties.
You would expect only slight physical and chemical weathering under natural conditions of
(a) lower mean annual rainfall and temperatures. (b) temperatures below freezing. (c) higher temperatures and lower precipitation. (d) extreme cold and high precipitation.