Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that _____
A) have identical chemical formulas but differ in the branching of their carbon skeletons
B) are mirror images of each other
C) differ in the location of their double bonds
D) differ in the arrangement of atoms around their double bonds
B
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Species diversity of plankton in the North Atlantic has been reduced by
a. global warming. b. oil spills. c. toxic compounds. d. solar flares. e. alteration of surface currents.
The movement of alleles among populations is called _____
a. bottleneck b. mutation c. founder effect d. gene flow e. genetic drift
Deserts are usually found between what
latitudes? a. 0?15 degrees b. 15?25 degrees c. 25?40 degrees d. 40?60 degrees e. 60?90 degrees
The bacteria that cause botulism cannot live in the
presence of a. carbon dioxide. b. oxygen. c. glucose. d. water. e. ATP.