The Images Above Are of DNA at Various Levels of Coiling

question 55

Multiple Choice

The images above are of DNA at various levels of coiling and folding. Use this image to answer the questions below.
-For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate. They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labelling the nitrogens would provide a stronger signal than labelling the phosphates. Why won't this experiment work?

• A)There is no radioactive isotope of nitrogen.
• B)Radioactive nitrogen has a half-life of 100 000 years, and the material would be too dangerous for too long.
• C)Avery et al. have already concluded that this experiment showed inconclusive results.
• D)Although there are more nitrogens in a nucleotide, labelled phosphates actually have 16 extra neutrons; therefore, they are more radioactive.
• E)Amino acids (and thus proteins)also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.

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