The introduction of wolves into Yellowstone National Park in 1991 resulted in
A) a decline in habitat for the entire community.
B) ecological changes involving numerous plant and animal species.
C) the migration of most of these wolves out of the park and back to Canada.
D) the death of all of the wolves, likely due to an insufficient amount of available prey.
Answer: B
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Oxytocin and cholecystokinin are transported through the bloodstream and arrive at the uterus at the same time. Oxytocin causes the uterus to contract, whereas cholecystokinin has no effect. Why?
A. The uterus has receptors for oxytocin, but not for cholecystokinin. B. Oxytocin blocks the activity of cholecystokinin. C. Oxytocin alters gene expression patterns, whereas cholecystokinin does not. D. Oxytocin is able to diffuse through the plasma membrane of uterine cells, whereas cholecystokinin cannot. E. Oxytocin is at a higher concentration in the bloodstream than cholecystokinin.
In the process of differentiation,
a. some daughter cells usually receive varying assortments of genes. b. cells with identical assortments of genes come to have different individual genes expressed. c. cells become specialized as a result of meiosis. d. daughter cells acquire different characteristics as a result of mutations that have occurred. e. all of these occur
The genetic information in viruses
A. is always DNA. B. is always RNA. C. is found in the nucleus of the virus. D. can be replicated outside of a cell. E. is either DNA or RNA.
According to the International Union for Conservation of Nature (IUCN), which of the following sequences shows groups with the highest percentage of species in danger of extinction, from most endangered (on the left) to least endangered (on the right
)? A) plants ? amphibians ? birds B) amphibians ? birds ? plants C) birds ? plants ? amphibians D) plants ? birds ? amphibians