An eager grad student attempted the famous Meselson and Stahl experiment with a twist. She first grew E. coli in media containing 'light' 14N isotopes which the bacteria incorporated into their DNA. She then switched to 'heavy' media containing 15N isotopes and grew the bacteria for 2 generations. She then switched back to media containing 14N isotopes and grew the bacteria for 1 more generation. She isolated the DNA and analyzed the molar ratios of 15N:15N DNA, 15N:14N hybrid DNA, and 14N:14N DNA by centrifugation. Assuming semi-conservative replication, the expected molar ratios are: Group of answer choices
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Biology, 21.06.2019 23:10
You arrive late to a biological seminar. however, just as you enter the room, you hear the speaker referring to the "five-prime end" and the "three-prime end" of a macromolecule. immediately, you know that they are talking about a: ]
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Biology, 22.06.2019 15:40
During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.
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Biology, 22.06.2019 21:30
The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.
Answers: 1
An eager grad student attempted the famous Meselson and Stahl experiment with a twist. She first gre...
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