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6. In an experiment performed by Meselson and Stahl, DNA in bacterial cells was labeled with a heavy 15N isotope for many generations, after which cells were placed into a medium containing the light 14N isotope. DNA was isolated from these bacteria and its density was analyzed by ultracentrifugation in several generations of cells. Partial results of their experiment are shown below. Light 14N DNA Intermediate 14N/15N DNA Heavy 15N DNA parental DNA 1st generation 2nd generation 3rd generation A. Draw the position(s) of the DNA band(s) obtained in the second generation (4 points). B. Draw the position(s) of the DNA band(s) obtained in the third generation (4 points). C. This experiment demonstrated that organisms replicate their DNA using a ____________________________________ mode of DNA replication. (2 points)

          6. In an experiment performed by Meselson and Stahl, DNA in bacterial cells was labeled with a heavy 15N isotope for many generations, after which cells were placed into a medium containing the light 14N isotope. DNA was isolated from these bacteria and its density was analyzed by ultracentrifugation in several generations of cells. Partial results of their experiment are shown below.

Light 14N DNA
Intermediate 14N/15N DNA
Heavy 15N DNA

parental DNA
1st generation
2nd generation
3rd generation

A. Draw the position(s) of the DNA band(s) obtained in the second generation (4 points).
B. Draw the position(s) of the DNA band(s) obtained in the third generation (4 points).
C. This experiment demonstrated that organisms replicate their DNA using a
____________________________________ mode of DNA replication. (2 points)

6. In an experiment performed by Meselson and Stahl, DNA in bacterial cells was labeled with a heavy 15N isotope for many generations, after which cells were placed into a medium containing the light 14N isotope. DNA was isolated from these bacteria and its density was analyzed by ultracentrifugation in several generations of cells. Partial results of their experiment are shown below.

Light 14N DNA
Intermediate 14N/15N DNA
Heavy 15N DNA

parental DNA
1st generation
2nd generation
3rd generation

A. Draw the position(s) of the DNA band(s) obtained in the second generation (4 points).
B. Draw the position(s) of the DNA band(s) obtained in the third generation (4 points).
C. This experiment demonstrated that organisms replicate their DNA using a
mode of DNA replication. (2 points)

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