The Y chromosome can be used to trace ancestry because:
A. natural selection favors specific mutations
in specific places.
B. mutations in the Y chromosome occurred
as people migrated around the globe.
C. mutations in the Y chromosome are
independent of mutations in mitochondria.
D. mutations in the Y chromosome occur only
in a few locations.
E. nonmutant Y-chromosome genotypes are
eliminated from human populations.
B
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Sustained muscle contraction without relaxation between successive stimuli is called _____
A) tonus B) tetanus C) an all-or-none response D) fatigue E) a spasm
The principle of comparative advantage is associated with
a. restricting consumer choices. b. greater production at higher prices. c. specialization and exchange. d. comparing the efficiency of alternative tariffs.
Skin is able to prevent most microorganisms from entering the body by
A) producing alkaline secretions. B) having keratin in the uppermost layer. C) production of antibodies. D) the adhesion junction in the skin preventing bacteria from entering. E) releasing macrophages on the skin surface.
What is the correct sequence of the reagents in the Gram stain technique?
a. safranin, crystal violet, alcohol, iodine b. alcohol, iodine, crystal violet, safranin c. crystal violet, iodine, alcohol, safranin d. iodine, alcohol, safranin, crystal violet