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    how does the evidence of the meselsohn and stahl experiment involving Nitrogen isotopes help to support the theory of semi-conservative dna replication?

    need sum quick help that....plzzzz, thanks
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    (Original post by urban_flavaz)
    how does the evidence of the meselsohn and stahl experiment involving Nitrogen isotopes help to support the theory of semi-conservative dna replication?

    need sum quick help that....plzzzz, thanks
    Basically, the isotope (not the normal one) is heavier than the normal one. You start of with one strand of DNA, then when they replicate both strands of DNA are lighter and appear higher in the test tube so that mean half the isotope when to one molecule of DNA and the other half to the other molecule, so it shows half the original DNA molecule went to make half of the daughther DNA, hope that helps! :tsr:
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    You might find this site helpful:

    http://www.dnaftb.org/dnaftb/20/concept/

    Click on 'animation': it's fairly clear, albeit a bit patronising at times!
 
 
 

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