The crater believed to be the site of the meteor impact that caused the extinction of the dinosaurs is on the coast of:
A. Alaska
B. Kenya
C. Mexico
D. India
E. China
Answer: C
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Cholera can be transmitted by water or food
Indicate whether the statement is true or false.
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.
Which statement is true of Planaria?
a. They have a well-developed circulatory system. b. They have a mouth located in their anterior end. c. They expel wastes via the action of ciliated flame cells. d. They contain a primitive, ladder-like skeletal system.
Antibiotics generally reduce the severity of septic shock by lysing the target bacteria.
a. true b. false