Which of the following is not a typical characteristic of K-selected plant species?
A. small size
B. slow growth
C. long life span
D. few large seeds
E. poor seed dispersal
A. small size
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How is initiation at oriC regulated in bacteria?
A. SeqA binds to hemimethylated DNA and sequesters the newly replicated origin. B. DnaA-ADP, formed when DnaA hydrolyzes its ATP, cannot maintain the destabilization of the origin so the closed complex reforms. C. The Hda protein binds the ? clamp causing DnaA to hydrolyze its ATP. D. RNA polymerase activity produces superhelical twisting that promotes melting of the origin by DnaA. E. All of these choices are correct.
The buildup of genetic differences between isolated populations is
a. gene flow. b. genetic equilibrium. c. divergence. d. adaptation. e. natural selection.
The accompanying figure represents a chromosome at metaphase of mitosis. How many DNA molecules are present in this chromosome?
A) one B) two C) four D) more than four E) impossible to determine
According to the above figure, which letter corresponds to the lowest tubular fluid osmolarity under normal conditions?
A. A B. B C. C D. D E. E