First observed by Lederberg and Zinder (1952) in Salmonella typhimurium
A. Transformation
B. Transduction
C. Conjugation
D. All of the answers are correct
B
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Allof the following evidence supports the RNA world hypothesisexcept:
A. RNA can function as a genome. B. An RNA component of ribosomes catalyzes the synthesis of proteins. C. RNA can serve a structural role. D. RNA stabilizes membranes. E. RNA regulates gene expression.
The ecosystem that would most likely have a high net primary productivity is a
A. desert. B. tropical rain forest. C. boreal forest. D. temperate forest. E. tundra.
The letter B” in the above figure represents its
a. shell. b. mantle. c. gills. d. siphon. e. none of these.
The validity of scientific discoveries should be based on
a. morality. b. aesthetics. c. philosophy. d. economics. e. evidence.