Cnidarians are able to capture prey with the aid of _____, harpoon-like organelles that are often tipped with neurotoxins
A. choanocytes
B. nematocysts
C. mesoglea
D. polyps
E. none of these
B
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The process by which water is "pulled" up through the xylem columns of plants as it evaporates out of the leaves is called
A. respiration. B. transpiration. C. osmosis. D. anhydration. E. stomatization.
Most of the water absorbed by the plant enters through the
A. root hairs. B. root cap. C. stomata. D. lenticels. E. root apical meristem.
The secondary (anamnestic) immune response is due to __________.
A) persistent high levels of antibody after the initial exposure to antigen B) long-lived memory cells C) long-lived T helper cells D) long-lived antibody-producing plasma cells
As a result of studying lactose intolerance in people from different geographic regions, scientists were able to determine that _________.
A. there is no evolutionary significance to their study B. mutations have nothing to do with evolution C. there is only one possible mutation that will affect lactose intolerance D. natural selection could favor anyone with a mutation for a permanently active lactase gene