Subunit vaccines are safer than traditional vaccines because they
A) are acellular.
B) are administered in food.
C) do not pose a risk for causing the disease.
D) are acellular and do not pose a risk for causing the disease.
E) are acellular and can be administered in food.
D
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Why does the number of species on an island level off at S?
A. Because resources become scarce as more species colonize an island. B. Because predation increases as more species colonize an island. C. Because extinction rates increase as more species colonize an island. D. Because colonization rates eventually decrease. E. All of the answer options are correct. F. None of the answer options is correct.
At what point during development does the embryo form three germ layers?
A. when the nervous system develops B. when it forms the inner cell mass C. when it becomes recognizable as human D. when it begins cleavage E. when it forms the gastrula
When blood glucose is low, alpha cells secrete
__________, which calls for glycogen breakdown and glucose release by the liver. Fill in the blank(s) with the appropriate word(s).
We can test the relative permeability of a phospholipid bilayer by using a synthetic membrane that does not contain any protein components. Some uncharged, polar molecules are found to diffuse freely across these membranes, to varying degrees
Which of the following has the lowest rate of diffusion across an artificial membrane? Why? (a) glucose (b) water (c) glycerol (d) ethanol