Individuals with nicotine acetylcholine receptors that bind tightly to nicotine are more likely to _____
a. have a family member who is resistant to nicotine addiction
b. have behavioral disorders
c. have mutations in the GABBR2 gene
d. be vulnerable to nicotine addiction
e. show resistance to nicotine addiction
d
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Legionnaires' disease is so named because
A. it was a common infection among foot soldiers. B. it was first identified at a convention of the American Legion. C. it caused a large epidemic among members of the French Foreign Legion. D. None of the choices are correct.
Resistance of sickle cell disease carriers to malaria illustrates
A) genetic drift. B) a population bottleneck. C) balanced polymorphism. D) a founder effect.
A neuron sends information across a chemical synapse by
a. movement of sodium ions from the first cell through the membrane of the second. b. electrons from the first cell that induce permeability changes in the second. c. neurotransmitter molecules that penetrate into the second cell. d. fusion of the plasma membrane of the first cell with the membrane of the second. e. neurotransmitter molecules that bind to membrane receptors on the second cell.
Cancer is a disease caused by mutations. Yet in most instances if one of your parents tragically died from cancer, this does not put you at greater risk than a person whose parents do not develop cancer. How can cancer be caused by mutations and yet not
be heritable? A) Most cancers arise from mutations in germ-line cells. B) Cancer-causing mutations are repaired in offspring but not in parents. C) Most cancers arise from mutations in somatic cells. D) The mutations that cause cancer are special and cannot be passed on regardless of what type of cell they occur in.