The giant squid axon has been used extensively in research to determine the mechanisms by which neurons generate electrical signals. Scientists used microelectrodes to measure the resting membrane potential (inside relative to outside) and discovered a difference of
A. ?300 mV.
B. 0 mV.
C. ?70 mV.
D. 70 mV.
E. 300 mV.
Answer: C
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Substance A is synthesized in the liver, travels through the circulatory system bound to a carrier protein, and causes a
change in gene expression in a target cell. This is an example of ____.
a. autocrine signaling b. paracrine signaling c. long-distance signaling d. local signaling e. communication by direct contact
A graduate student is researching the spread of mosquito vectors and dengue fever into the southern United States. She has collected a substantial amount of data regarding the locations where the vector has been detected as well as the incidence of the dengue fever virus in both the vector population and in humans. What application would enable her to effectively illustrate patterns of vector and disease spread?
A. Geographic Information Systems B. DNA microarrays C. Remote sensing D. DNA fingerprinting
The average life expectancy for males in the United States is ____
a. 80 years b. 79 years c. 76 years d. 74 years e. 65 years
Energy flow in an ecosystem begins with
A. autotrophs. B. detritivores. C. carnivores. D. omnivores. E. herbivores.