Hello, Can you please help me out with my biology assignment, the questions I pr

Question

Hello, Can you please help me out with my biology assignment, the questions I provided (4,5,6, and 9). Thank You!

4-6. Meselson and Stahl performed experiments to determine how DNA was replicated. Before their experiments there were 3 potential models that could explain how DNA was replicated conservative, semi-conservative or dispersive. In their experiments, Meselson and Stahl grew bacteria in cultures containing only 15N nitrogen for many generations so that the DNA was almost entirely composed of sN-containing nucleotides. They then switched the cells into growth media that contained only N. After growing cells for one generation they were able to rule out the conservative model of DNA replication. 4. On the figure below draw the results for the first generation. (4 points) First Generation 14 ht Ali intermedia ntemed ate Controls 5.The experiment described above uses the isotopes N and asN to label DNA. At the atomic level what is the between Nand sN? Points Some number cre fvo is Het M has nach 6. Suppose a double-stranded molecule similar to DNA such that one molecule Nicowi contains two strands and the other molecule contains two new strands. Such replication would be an instance of what type of replication? extra pointsO conservative repl catton Conservative replication become, e it eers new

Explanation / Answer

After ist generation results would be like: N14 labelled DNA ON top followed by DNA that is labelled with both heavy and light nitrogen which will be followed by N 15 labelled DNA. So the DNA that is labelled with both heavy and light nitrogen will be sandwiched between heavy and light labelled DNA

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