When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.In an experiment, neither heat-killed R strain nor heat-killed S strain killed the mice. This finding
A. supports Hypothesis I.
B. supports Hypothesis II.
C. supports Hypothesis III.
D. rejects Hypothesis I only.
E. rejects Hypothesis II only.
F. rejects Hypothesis III only.
G. does not support or provide information to reject any of these hypotheses.
Answer: G
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Most of the mass of the solar system is made up of the elements
a. carbon and hydrogen. b. oxygen and hydrogen. c. helium and hydrogen. d. nitrogen and hydrogen. e. nitrogen and carbon.
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A) cloning B) genetic engineering C) gene therapy D) pharmacogenomics
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are required to support other cells growing on top of the tissue. D. Epithelial tissues are programmed to stop dividing after only a few cell cycles. E. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur.