Chemoheterotrophs
A. use sunlight as an energy source.
B.
use preformed organic molecules as a carbon source.
C.
use preformed organic molecules as an energy source.
D. use inorganic chemicals as an energy source.
E.
use preformed organic molecules as a carbon source AND as an energy source.
E
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Pasteurization of milk
A. reduces microbial growth by decreasing availability of water. B. usually eliminates all disease-causing organisms. C. is a method for sterilization of food items. D. is no longer used for food processing in the United States.
A concentration gradient ceases to exist when
a. all the molecules have moved from high concentration to low. b. the membrane pores close. c. the temperature drops. d. there is no net movement. e. bulk flow intervenes.
Complete reproductive isolation is evidence that
what has occurred? a. extinction b. speciation c. polyploidy d. hybridization e. gene flow
Which of the following is true regarding the
hydrologic cycle? About 90% of the water that evaporates from the oceans a. remains in the atmosphere. b. is transported over land. c. precipitates onto land. d. precipitates onto the oceans. e. ends up as groundwater.