You have three strains of mice: A, B, and C. You experimentally manipulate each strain and find that all three show increased secretion of molecule X
Now you perform a parabiosis experiment with the three combinations of these mice: AB, AC, and BC. You perform the same experimental manipulation as above on one mouse of each pair without directly affecting the other mouse and look for effects on the other mouse. You find no detectable effect on the unmanipulated partner in any of the combinations. What is the logical conclusion based on these results? The effect on molecule X ____.
A) is not mediated by hormones
B) is not mediated by nerves
C) was just an artifact of the first experiment
D) is controlled by higher integrative centers of the brain
Answer: A
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In cellular respiration, oxygen:
A. gains electrons and is an oxidizing agent. B. loses electrons and is a reducing agent. C. gains electrons and is a reducing agent. D. loses electrons and is an oxidizing agent. E. None of the answer options is correct.
Nucleotides are monomers of
a. complex lipids. b. proteins. c. polysaccharides. d. nucleic acids. e. all of these.
A black bear population being fragmented into
separate smaller populations by a newly constructed road and the smaller populations prevented from interacting is an example of
a. behavioral isolation. b. temporal isolation. c. ecological isolation. d. mechanical isolation. e. genetic isolation
What is an innate, nondirectional response to a stimulus (such as increased movement under certain conditions) called?
A. Taxis B. Kinesis C. Migration D. Habituation E. Imprinting