Allopatric speciation typically occurs in two stages. The first stage is ____ of two populations and the second stage is
____.
a. geographic separation; reproductive isolation
b. natural selection; geographic separation
c. mutation; reproductive isolation
d. reproductive isolation; geographic separation
e. genetic drift; reproductive isolation
ANSWER: a
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a. humans and pigs b. moths c. tuna d. yeast
Which characteristic is typical of a cancer cell but not of a normal cell?
A) Cell division is inhibited when the cell contacts neighboring cells. B) The cell cycle lacks S phase. C) The cell has the ability to invade surrounding tissue. D) Cell death occurs after a limited number of divisions.
The enzyme that works in conjunction with ATP to produce bioluminescence is called __________. Fill in the blank(s) with the appropriate word(s)
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a. lipids b. minerals c. carbohydrates d. vitamins e. proteins