One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?
A) +ssRNA viruses
B) dsRNA viruses
C) -ssRNA viruses
D) retroviruses
E) both +ssRNA and -ssRNA viruses
D
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Refer to the accompanying figure. Which one of the following is NOT a plausible hypothesis to explain the differences in caterpillar appearance observed in this population?
A) The longer day lengths of summer trigger the development of twig-like caterpillars. B) The cooler temperatures of spring trigger the development of flowerlike caterpillars. C) Differences in air pressure, due to differences in elevation, trigger the development of different types of caterpillars. D) Differences in diet trigger the development of different types of caterpillars.
Processes that supply ATP, reducing power, and precursor metabolites are collectively referred to as ________ reactions.
A. synthetic B. generating C. redox D. fueling
The major mechanism of evolution is
a. species development. b. predation. c. fitness. d. natural selection.
Most of the early hominid fossils have been found in ________, a 2,000 mile fault line.
A. an area between Java and China B. the Neander Valley of Germany C. Royal Gorge, North America D. the East African Rift Valley