Which neurons of the autonomic nervous system have somas located in ganglions near target organs instead of in or near the spine?
a. parasympathetic preganglionic
b. sympathetic preganglionic
c. parasympathetic postganglionic
d. sympathetic postganglionic
c. parasympathetic postganglionic
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Why was it necessary to culture E. coli for multiple generations in the 14N-rich medium to rule out the dispersive model?
a. Nitrogen is frequently lost by cells during meiosis, so multiple generations were required to ensure that residual-free 15N in the cytoplasm was replaced by 14N from the new medium. b. Multiple generations were required to ensure that the samples did not contain significant quantities of DNA from other organisms, which would confound the analysis of E. coli DNA. c. After only a single generation, it was expected that the DNA extracted from E. coli would contain equal proportions of 15N and 14N in both the semi-conservative and dispersive models. d. Multiple generations of replication in the 14N-rich medium were required to rule out the possibility that the changes to the DNA mass were not the result of inevitable statistical noise.
In the comparison between a spiral staircase and a DNA molecule, the steps would correspond to
A. sugars. B. hydrogen bonds. C. base pairs. D. nucleotides. E. phosphates.
Hydrogen ion flow out of the thylakoid compartments ____
a. occurs between photosystems I and II b. is called the hydrogen transfer system c. provides energy to produce ATP molecules d. causes excitation of chlorophyll molecules e. requires the intermediary action of acceptor molecules
Which one of the following is the final
consequence of one or more of the others? a. resource partitioning b. competition c. predation d. parasitism e. parasitoidism