Secondary messengers perform which of the following functions?
A) amplification of a message
B) transmission of a message from the cell surface to its interior
C) both a and b
D) neither a nor b
C
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Morocco's most important nonagricultural primary export is
A. oil B. gas C. phosphate D. gold
Which of the following is NOT a main type of silicate structure?
A. sheets B. frameworks C. double chains D. triple chains E. single chains
The Moon attracts the oceans of the Earth due to gravity. The greatest gravitational attraction between the Earth and the Moon is at Earth's__________
a) nadir b) tangent c) zenith d) solar bulge e) barycenter
Air pollution emitted from industrial areas, especially products of combustion, such as oxides of sulfur and nitrogen, can be carried many kilometers downwind. Sometimes these particles and gases slowly settle to the ground in the dry form of ____
a. acid fog b. acid rain c. acid precipitation d. dry deposition e. wet deposition