In 2003, Japan restricted imports of beef from the United States because of fear of mad cow disease. This is an example of
a. an anti dumping measure.
b. protecting an infant industry.
c. a voluntary restraint measure.
d. a technical barrier.
d. a technical barrier.
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Those organisms that are covered by numerous, tiny locomotory structures belong to the phylum
a. Euglenozoa. b. Stramenopila. c. Parabasalia. d. Alveolata.
Each of the following contributes to the unidirectional propagation of nerve signals except
A) dendrites only receive signals. B) presynaptic neurotransmitter secretion is separated from postsynaptic receptors. C) neuron membranes have a refractory period following generation of an action potential. D) ion channels are oriented to transport ions only into the neuron. E) action potentials initiate the hillock and propagate only down the axon.
A student uses restriction enzymes to cut a DNA molecule into fragments. The digested DNA is loaded into the wells of an agarose gel and the gel is subjected to an electric current. Upon completion of the run, the gel is stained. The procedures described can be used to do all of the following EXCEPT
(A) isolate and purify certain DNA fragments (B) synthesize novel DNA molecules (C) study the activity of restriction enzymes (D) calculate the size of DNA fragments (E) identify the source of DNA material
A monophyletic group is a group that
A) descended from one ancestor. B) has the same fitness level. C) possesses one taxonomic trait that is the same. D) shares one phylogenetic marker.