A major change in evolutionary patterns over
long periods of time is best described as
a. macroevolution.
b. microevolution.
c. allopatric speciation.
d. directional selection.
e. sympatric speciation
A
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What conclusions did Beadle and Tatum reach with their studies of Neurospora?
a. Each mutant gene affected three enzymes. b. Each mutant gene affected a pair of enzymes. c. Each mutant gene affected only one enzyme. d. Mutant genes had no effect on the enzymes produced by the cells. e. Each mutant gene affected as many enzymes as were present in a particular metabolic pathway
Under what abiotic conditions can monomers spontaneously form polymers?
A) in the presence of oxygen gas B) when ribozymes are present to catalyze the reaction C) when a collection of organic molecules with a cell membrane are isolated D) when water evaporates from a hot surface
A chemist working in a pharmaceutical lab synthesized a new drug as a racemic mixture. Why is it important that she separate the two enantiomers and test each for its biological activity?
What will be an ideal response?
Erwin Chargaf demonstrated that in DNA the amount of A is about the same as the amount of G
a. true b. false