In polymerase chain reaction technology, the two strands of DNA are separated by:
a. gel electrophoresis.
b. treatment with restriction enzymes.
c. centrifugation.
d. exposure to high pH.
e. exposure to heat.
e
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Most coastal pollution comes from
a. oil spills from ships. b. dumping of trash. c. military disposal. d. runoff from urban and agricultural lands. e. nuclear power plants.
Steroid hormones include____
a. thyroid hormones b. oxytocin c. insulin and glucagon d. estrogen and testosterone e. epinephrine and norepinephrine
According to the animation, the reactions that occur between glucose and pyruvic acid
a. are only catabolic. b. are only anabolic. c. are neither catabolic nor anabolic. d. can either be anabolic or catabolic.
The responses observed in type IV hypersensitivities result from the action of
A) IgE antibodies and mast cells. B) T cells and phagocytes. C) IgG and complement. D) autoantibodies. E) inflammatory chemicals.