Which of the following is a nonpolar (hydrophobic) amino acid?
A) valine
B) serine
C) tyrosine
D) lysine
E) aspartate
A) valine
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What is the biological significance of genetic diversity between populations?
A) Genes for traits conferring an advantage to local conditions make microevolution possible. B) The population that is most fit would survive by competitive exclusion. C) Genetic diversity allows for species stability by preventing speciation. D) Isolated populations become more fit. E) Diseases and parasites are not spread between separated populations.
Body temperatures that fall below ____ may cause the heart to stop
a. 80? F b. 92? F c. 93? F d. 85? F e. 88? F
What is the most common blood type in the U.S. population?
A) type O- B) type B+ C) type AB- D) type O+
Suppose that a man and woman have a son with a rare genetic disorder known to be X-linked. There is no occurrence of the disorder on the woman's side of the family, but the man's brother has it, as does her father. What is the probability that the son's defective allele came from the man?
a. 0% b. 25% c. 50% d. 100%