Which of the following events involves the release of enzymes?
A. cell cleavage
B. cortical reaction
C. egg membrane depolarization
D. increase in cytosolic calcium within the egg
E. the fusion of egg and sperm nuclei
B. cortical reaction
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Hydrogen bonding is strongest between
a. adenine and guanine. b. uracil and thymine. c. guanine and uracil. d. adenine and thymine. e. cytocine and guanine
Which of the following areas is not known to contain stem cells?
A) the skin B) bone marrow C) the umbilical cord D) muscle
The Clean Air Act of 1990 was important because it specifically
A. stated that all politicians would from then on be pro-environment. B. detailed ways of making our air crystal clean by the year 2000. C. required scrubbers on smokestacks of coal-fired plants. D. punished polluters.
Virulent viruses multiply within infected cells and eventually
A. cause lysis of the host cell, releasing new viruses. B. cause an alternation of generations in the host cell, releasing new viruses. C. cause the transduction of the host cell, releasing new viruses. D. cause a transfer of material from the host cell, releasing new viruses. E. cause the transformation of the host cell, releasing new viruses.