Which of the following is true of cytokines?
A) They are highly specific antibodies.
B) They are long lived.
C) They are stored in cells.
D) None of these is correct.
D
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North-flowing winds along the West Coast of North America produce ____, which has no direct effect on climate or productivity
A) ?upwelling B) ?diverging currents C) ?downwelling D) ?converging currents
The letters H and L on a surface weather map refer to regions of high and low ____
A) temperature B) winds C) pressure D) latitude
Hail is usually associated with ____ clouds
a. stratus b. cumulus c. stratocumulus d. altocumulus e. cumulonimbus
Drawbacks to the use of coal-based alternative fuels include all of the following except
A. it will significantly reduce the life expectancy of coal reserves. B. it will increase demand for conventional crude oil. C. it will increase environmental problems already associated with the mining and burning of coal. D. its production generates large amounts of carbon dioxide.