The bright coloration of male birds is often the result of
A) gene flow.
B) genetic drift.
C) sexual selection.
D) stabilizing selection.
E) coevolution.
C
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The cell membrane can be described most accurately as
A) permeable to all small molecules and ions but impermeable to larger ones. B) permeable to only larger molecules. C) permeable to some molecules and impermeable to others. D) impermeable to all polar molecules. E) permeable to all molecules.
People with the disease known as sickle-cell anemia are often better able to survive malaria because of
a. balanced polymorphism. b. heterozygote advantage. c. frequency dependent selection. d. disruptive selection. e. stabilizing selection.
This group occupied Europe and western Asia from about 150,000 to 28,000 years ago. They had a
heavier build, more pronounced brow ridges, and slightly larger brains than modern humans, and were culturally and technologically sophisticated.
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
Astronauts who spend significant time at zero gravity often become somewhat anemic upon return to Earth. One way to compensate for the process that leads to this anemia might be to supply the astronauts with ________ during the mission in space
a. a diet higher in protein and iron b. a diuretic, which will cause them to excrete more fluid c. a growth factor that leads to increased red blood cell production d. higher levels of oxygen in the shuttle atmosphere e. more opportunities to rest or sleep