What is the purpose of dialysis treatments?
A. To constrict blood vessels to prevent death from dehydration
B. To keep the airways open so one can breathe
C. To replenish oxygen in the bloodstream
D. To detoxify dangerous chemicals in the bloodstream
Answer: D
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When solutes are unloaded from phloem, water ____
a. is pumped into the phloem by active transport b. leaves the xylem by osmosis c. moves into the phloem by facilitated diffusion d. is pumped out of the phloem by active transport e. leaves the phloem by osmosis
The major obstacle to the use of xenotransplants is ________________
A. not enough human donors B. finding the right sized animals C. resistance from opponents of genetically modified animals D. organ rejection by recipients E. more than one of these
Many diseases are the result of a problem with cell signaling. Which of the following diseases BEST exemplifies this fact?
a. a specific type of cancer, which is caused by a truncated receptor that becomes stuck in the activated form. b. congestive heart failure, which is caused by chronic high blood pressure due to excessive sodium intake c. familial hypercholesterolemia (high cholesterol in the blood), which is caused by a decrease in the number of receptors for cholesterol. d. cystic fibrosis, which is caused by a mutation in a channel protein, resulting in a buildup of mucus
As predator and prey species acquire new adaptations to help them survive the constant "arms race" between them, what evolutionary phenomenon is occurring?
A) Artificial selection B) Competition C) Coevolution D) Sexual selection E) Genetic drift