Neurotransmitters
A. are used in electrical synapses only.
B. bind to receptors in the target neuron with a "lock and key" fit.
C. are used in both electric and chemical synapses.
D. are moved to target neurons via active transport.
Answer: B
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Ammonites were one of the major groups of Mesozoic marine fauna to go extinct at the end of the Cretaceous
a. True b. False
A(n) ____ heating system, which is usually mounted on a roof or on special racks that face the sun, captures energy from the sun by pumping a heat-absorbing fluid such as water or an antifreeze solution through special collectors.
A. hydrogen B. active solar C. geothermal D. biofuel E. passive solar
All of the following are results of transport innovations EXCEPT
A) decentralization of manufacturing processes in industrialized countries. B) decentralization of manufacturing processes in industrialized countries from suburbs toward major cities. C) decentralization of manufacturing processes in industrialized countries from central regions to more peripheral ones. D) relocation of MNCs based in industrialized countries to to free trade zones in the 3rd world. E) reduction in circulation costs.
Compared with terrestrial radiation, radiation from the Sun has a
A. shorter wavelength. B. higher frequency. C. both of these D. none of the above