[Answer] 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 labeling the nitrogens would provide a stronger signal than labeling 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) Although there are more nitrogens in a nucleotide labeled phosphates actually have 16 extra neutrons; therefore they are more radioactive.D) Amino acids (and thus proteins) also have nitrogen atoms; thus the radioactivity would not distinguish between DNA and proteins.

Answer: (D) Amino acids (and thus proteins) also have nitrogen atoms; thus the radioactivity would not distinguish between DNA and proteins.
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 labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won’t this experiment work?A) There is no radioa…

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