Which of the following best describes diversity change through time in succession?
A) steady increase over time
B) steady decrease over time
C) starting and ending with high diversity
D) highest diversity in middle successional stages
D
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Davis, Weintraub, and Lasser found three genes that are involved in muscle differentiation by
A. eliminating all the gene candidates that were expressed in both muscle and nonmuscle cells. B. finding all the genes that were expressed in common between two different muscle cell lines. C. cloning all the genes that were expressed in muscle cell lines to determine if any of these genes could cause nonmuscle cells to differentiate into muscle cells. D. mutating genes expressed only in muscle cells to see if differentiation could be prevented.
Why is the production of transgenic plants somewhat easier than the production of transgenic animals?
A. Plant cells are pluripotent. B. Plant cells are more stable than animal cells. C. Plant cells are totipotent. D. Plant cells are more highly evolved. E. Plant cells readily take up vectors, whereas animal cells do not.
A bacterial cell has a nonsense mutation that prevents it from producing a functional sigma subunit for RNA polymerase. Inability to synthesize a functional sigma subunit would have the most direct effect on
A. translation termination. B. translation initiation. C. transcription termination. D. transcription initiation. E. transcription elongation.
In transcription, a copy of _________________ is made. In translation, that copy is used to direct the production of a(n) _________________.
A) the gene's sequence of bases; genome B) the gene's sequence of bases; protein C) a protein's sequence of amino acids; gene D) a protein's sequence of bases; amino acid E) the gene's sequence of bases; amino acid