Secondary succession occurs
a. after a fire.
b. on a new volcanic island.
c. on bare rock.
d. on land exposed as a glacier retreats
e. none of these answers
Answer: a
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Graft-versus-host disease is primarily a
A. type I reaction. B. type II reaction. C. type III reaction. D. type IV reaction. E. type V reaction.
The most common joint injury is a
a. separated shoulder. b. fractured knee. c. broken wrist. d. dislocated shoulder. e. sprained ankle.
These structures are held together by cohesin:
A. Homologous chromosomes B. Solenoids C. Sister chromatids D. Nucleosomes
Each of the following statements about carbon is TRUE EXCEPT which one?
A) All organic molecules contain carbon. B) Carbon atoms form four covalent bonds. C) Carbon atoms form diverse molecules that may be linear, branched, or circular. D) Carbon can form strong hydrogen bonds with other elements. E) Carbon can form bonds with hydrogen, oxygen, nitrogen, as well as another carbon atom.