In New Mexico, large expanses of black lava create patches of unique habitat. If, in every generation, selection favors the darkest colored pocket mice in those habitats because they are best hidden from predators, this would be an example of:
A. balancing selection.
B. stabilizing selection.
C. directional selection.
D. disruptional selection.
E. heterozygote advantage.
C
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Earth's early atmosphere contained (select all that apply):
A. methane. B. water. C. nitrogen. D. hydrogen. E. organic molecules.
The ____ regulates the movement of food into the stomach and the ____ regulates the passage of food into the small
intestine.
a. epiglottis; gastroesophageal sphincter b. epiglottis; pyloric sphincter c. gastroesophageal sphincter; epiglottis d. gastroesophageal sphincter; pyloric sphincter e. pyloric sphincter; anal sphincter
A gel electrophoresis is performed, but when the gel imager is used, no bands appear. The researcher might have forgotten to
A) add electric current. B) add antibody. C) ligate the DNA fragments together. D) include DNA dye. E) include an RNA probe.
A 6.85 kb EcoRI fragment of DNA is shown below. The location of several restriction sites is indicated. Scale is approximate.
If you were to completely digest this fragment of DNA with PstI, how many pieces of DNA would you obtain?
A. 1 B. 2 C. 3 D. 4