Allopatric speciation occurs because a population
A. becomes geographically isolated and undergoes genetic change.
B. becomes extinct and is replaced by a population of a different species.
C. shows little genetic change from generation to generation.
D. experiences hybrid sterility.
E. merges with another population of the same species.
Answer: A
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The innate response resists a particular foreign agent; moreover, innate immune responses improve on repeated exposure to the agent.
Answer the following statement true (T) or false (F)
In a large population on a Pacific island, a few individuals had a mutation that caused them to have
different colored eyes. After a hurricane, the population was reduced to only a few individuals, but some of those individuals had the rare eye color mutation. Now, after many generations, almost half of the population on this island has different colored eyes. This is an example of _____________. Fill in the blank(s) with the appropriate word(s).
In biological membranes, the phospholipids are arranged in a
A) single layer, with the fatty acids facing the interior of the cell. B) bilayer, with the phosphorus groups in the interior of the membrane. C) bilayer, with the fatty acids pointing toward one another. D) single layer, with the phosphorus-containing region facing the interior of the cell. E) bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell).
As they begin to develop, in which direction do the palatine shelves grow?
A. Lateromedially B. Mediolaterally C. Obliquely and inferiorly D. Obliquely and superiorly E. Superiorly