During a fight, a boxer received a hard blow to the side of his head. The boxer was unable to recognize
and interpret words. Which specific area of the brain must have been damaged during the fight?
a. the cortex of the cerebellum
b. Broca's area
c. the corpus callosum
d. Wernicke's area
e. the brain stem
D
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The mechanism of phase variation in Salmonella typhimurium:
A. uses site-specific recombination to invert the fljA and fljB genes so they now are not contiguous with their promoter. Expression of these genes is now prevented. B. uses site-specific recombination to invert the fljA and fljB promoter, preventing transcription of the two genes. Without repressor the fljC protein is now expressed. C. uses site-specific recombination to delete the repressor, fljA. Without repressor the fljC protein is now expressed. D. uses site-specific recombination to delete the fljB gene so only fljC can be expressed. E. None of the choices given is true.
According to researchers Parmesan and Yohe, how are living systems responding to anthropogenic global warming?
a. All biomes are remaining intact but are shifting their distributions northward. b. Some species are moving northward and others are not, so communities are being disrupted. c. All biomes are remaining intact, but some are shifting their distributions and other biomes are not. d. Most plants are shifting their distributions northward, but most animals are not. e. Most animals are shifting their distributions northward, but most plants are not.
Action potentials generated in rod and cone cells are
processed and integrated by __________ cells. a. bipolar b. ganglion c. lateral geniculate nucleus d. visual cortex e. all of these
Where would you find smooth muscle tissue in your body?
A) in your heart B) in the walls of your stomach C) attached to bones D) None of the above is correct.