Reductionism refers to the method of investigating structures by:
a. studying the whole.
b. studying emergent properties.
c. reducing our knowledge about these structures.
d. studying the parts of the structures.
e. studying many structures together.
D
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What happens in the third step of the type I topoisomerase reaction?
A. The enzyme changes to the open conformation. B. The unbroken DNA strand passes through the break in the first strand. C. Active-site tyrosine acts as a nucleophile and attacks one strand to form an enzyme-linked intermediate. D. The enzyme changes to the closed form. E. The 3' OH of the broken strand attacks the link between the active site tyrosine and the 5' end of the broken strand, resulting in religation of the broken strand.
Most pH buffers are ____
a. strong acids b. weak acids or weak bases c. weak acids d. strong bases e. strong acids or strong bases
The mode of natural selection in which extreme phenotypes are less fit than the optimal intermediate phenotype is
A. convergent selection. B. disruptive selection. C. artificial selection. D. directive selection. E. stabilizing selection.
The seed coat of a pine seed
a. is derived from the integuments. b. is produced by the micropyle. c. surrounds the male gametophyte. d. is divided into the hypocotyl-root axis and epicotyl.