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I need answer to those questions please ASAP I'm stuck D Question 12 0.5 pts After the first
round of replication, Meselson and Stahl found that all the DNA were of intermediate density
indicating that the DNA molecules were made up of a hybrid of N15 (aka 15-N, or heavy isotope
of N) and N14 (aka 14-N, or light isotope of N). How did they determine that the correct model
of DNA replication was semi- conservative and not dispersive? Recap of Meselson and Stahl's
experiment: https utube.com/watch?V 4gdWOWiioBE 1799: H O Because if it had been the
dispersive model, after the first round of replication half the DNA would have been heavy and
half would have been light. O After the second round, half the DNA were of low density and half
the DNAwas of intermediate density after the second round of replication, all the DNA were
were of intermediate density O after the second round, half the DNA were of high density and
half the DNA were of low density.
Solution
Question 12
How did they determine that the correct model of DNA replication was semi conservative and
not dispersive?
After the second round, half the DNA was of low density and half the DNA was of intermediate
density
Explanation
After conducting the experiment, they came to a conclusion that
After first generation, they obtained DNA molecules of intermediate density
After second generation, they obtained DNA, in which half is intermediate and other half is light.
This supports the fact the replication if of semi-conservative type.
After first generation, when DNA labeled with 15N will act as template for the synthesis of new
strands, the obtained two strands will have one strand of 15N and other strand of 14N, resulting
in intermediate density.
But in second generation, when these N15-14N strands act as template, you will get four double
strands, 2 strands with 15N-14N, 2 strands with 14N-14N, giving you
Question 14:
Answer is B
It will have two double-stranded DNA of intermediate density and two double-stranded DNA of
light strands at the end of second generation.
Question 15
DNA replication is dispersive
That is the reason why one clump is regular whitish color, if the replication is semi conservative
then this lump should be intermediate glowing green in color due to the present of altered form
of nitrogen.
Question 16
Answer is a
The resulting strands will be light and heavy; you cannot find any intermediate strand as here the
two newly synthesized strands after one round of replication will form double helix, whereas the
old two strands will remain together as one double strand.

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I need answer to those questions please ASAP Im stuck D Question 1.pdf

  • 1. I need answer to those questions please ASAP I'm stuck D Question 12 0.5 pts After the first round of replication, Meselson and Stahl found that all the DNA were of intermediate density indicating that the DNA molecules were made up of a hybrid of N15 (aka 15-N, or heavy isotope of N) and N14 (aka 14-N, or light isotope of N). How did they determine that the correct model of DNA replication was semi- conservative and not dispersive? Recap of Meselson and Stahl's experiment: https utube.com/watch?V 4gdWOWiioBE 1799: H O Because if it had been the dispersive model, after the first round of replication half the DNA would have been heavy and half would have been light. O After the second round, half the DNA were of low density and half the DNAwas of intermediate density after the second round of replication, all the DNA were were of intermediate density O after the second round, half the DNA were of high density and half the DNA were of low density. Solution Question 12 How did they determine that the correct model of DNA replication was semi conservative and not dispersive? After the second round, half the DNA was of low density and half the DNA was of intermediate density Explanation After conducting the experiment, they came to a conclusion that After first generation, they obtained DNA molecules of intermediate density After second generation, they obtained DNA, in which half is intermediate and other half is light. This supports the fact the replication if of semi-conservative type. After first generation, when DNA labeled with 15N will act as template for the synthesis of new strands, the obtained two strands will have one strand of 15N and other strand of 14N, resulting in intermediate density. But in second generation, when these N15-14N strands act as template, you will get four double strands, 2 strands with 15N-14N, 2 strands with 14N-14N, giving you Question 14: Answer is B It will have two double-stranded DNA of intermediate density and two double-stranded DNA of light strands at the end of second generation. Question 15 DNA replication is dispersive
  • 2. That is the reason why one clump is regular whitish color, if the replication is semi conservative then this lump should be intermediate glowing green in color due to the present of altered form of nitrogen. Question 16 Answer is a The resulting strands will be light and heavy; you cannot find any intermediate strand as here the two newly synthesized strands after one round of replication will form double helix, whereas the old two strands will remain together as one double strand.