After rigorous statistical analyses have shown a very low likelihood (usually 5% or less) of a result having occurred by
chance alone, the result is said to be ____.
a. quantitatively probable
b. probably random
c. statistically significant
d. due to sampling error
e. statistically probable
ANSWER: c
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Which of the following crosses lipid bilayers the fastest?
A) a sodium ion B) a small, polar molecule like water C) a large, polar molecule like glucose D) a small, nonpolar molecule like oxygen (O2)
What feature do the tree, ring, and web of life phylogenetic models share?
a. horizontal gene transfer between prokaryotes b. all species share a single common ancestor c. new species evolve from existing species d. speciation from the exchange of transposons
Growth factors work as signaling molecules. When they bind to receptors on target cells, they function to
A. activate proto-oncogenes, halting cell division. B. inactivate proto-oncogenes, stimulating cell division. C. inactivate proto-oncogenes, halting cell division. D. activate proto-oncogenes, stimulating cell division.
Most of Earth's water resides in
A) the oceans. B) the polar ice caps and glaciers. C) freshwater lakes, ponds, rivers, and streams. D) groundwater.