Which of the following carry messages from the receptor to the inside of the cell?
A) primary messengers
B) secondary messengers
C) both (a) and (b)
D) neither (a) nor (b)
C
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What is the most mountainous region of China?
A) north B) east C) west D) central E) south
Increasing the humidity
A) increases the density because humid air feels 'thick' B) increases the density because winds are usually weaker when the humidity is high C) decreases the density because humid air usually sinks D) decreases the density because the molecular weight of water is less than the molecular weight of the other major constituents of air
Orchard heaters and wind machines are most useful in preventing damaging low temperatures from occurring next to the ground on ____ nights
A) clear, windy B) cloudy, windy C) rainy D) clear, calm
One approach the World Trade Organization does NOT take to reduce barriers to trade is
A) it reduces or eliminates quotas on imports. B) it encourages subsidies on exports. C) it discourages subsidies on exports. D) it protects intellectual property rights. E) it reduces restrictions on movement of money.