If the blood brain barrier prevents toxic substances from getting into the central nervous system, how does alcohol
most likely impair a person's judgment?
a. alcohol acts on the peripheral nervous system, which then activates neurons in the cortex that impair judgment
b. alcohol acts on the liver, creating toxins that can cross the blood brain barrier, which then activate neurons in
the cortex that impair judgment
c. alcohol decreases blood oxygen levels, which leads to impaired judgment
d. alcohol can bind to glucocorticoid transporters in the brain, which causes impaired judgment by binding to
neurons in the cortex
e. because it is hydrophobic, alcohol can pass directly across the blood brain barrier and cause impaired
judgment by binding directly to neurons in the cortex
ANSWER: e
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Based on the theory of natural selection, if an allele is disadvantageous to a population, how could one expect the frequency of that allele to change over time?
a. the frequency of the disadvantageous allele would increase over time b. the frequency of the disadvantageous allele would decrease over time c. the frequency of the disadvantageous allele would not change over time d. it is impossible to determine how the allele frequency would change over time
In ____________________, one somatic cell is fused with an enucleated egg
Fill in the blank(s) with the appropriate word(s).
A zoo is hand-rearing an endangered species of songbird. What is the best approach to help prepare the males to attract mates?
A. Expose the males to a mentor male bird singing their species' song during the critical period. B. Expose the males to female pheromones from their species, to initiate development of song circuits during the critical period. C. Expose the males to each other during the critical period, to initiate development of song circuits during the critical period. D. Expose the males to a variety of birdsongs during the critical period. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about mating behaviors in male birds? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The preferred method for long term storage of bacteria is (freezing/refrigeration/lyophilization).
Fill in the blank(s) with the appropriate word(s).