One mechanism by which ions are specifically transported into the cell is the
A) gated channel.
B) alternating conformation model.
C) carrier protein transport.
D) uniport transport model.
E) all of the above
A) gated channel.
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Two solutions of differing glucose concentration are placed in a container separated by a selectively permeable
membrane that restricts large molecules like glucose, but allows the free diffusion of water. What will be the glucose concentration in the container after dynamic equilibrium has been reached?
a. The water molecules will be evenly distributed in the container, with more glucose molecules on one side than the other. b. The volumes of the solution will be different, with a higher volume on the side that originally contained the higher concentration of glucose. c. The volumes of the solution will be different, with a lower volume on the side that originally contained the higher concentration of glucose. d. The glucose concentration of the two solutions will be identical on both sides of the membrane, but the volumes will remain unchanged. e. The volume and concentrations will be unchanged on both sides of the membrane.
Which of these activities correlates with a reduced risk of Alzheimer’s disease?
a. electroconvulsive therapy b. smoking cigarettes c. playing a musical instrument d. taking vitamin supplements
With enough time and in the absence of other evolutionary mechanisms, genetic drift will ________
A) reduce the genetic variation in a population B) increase the genetic variation in a population C) have no effect on the genetic variation of a population D) None of the above.
In genetically altered mice, genes are transferred by injection into ____________________ that are
____________________ into a foster mother. Fill in the blank(s) with the appropriate word(s).