Why did hershey and chase label the viral dna with radioactive phosphorous and not radioactive sulfur?
a. dna contains phosphorus and no sulfur.
b. proteins contain phosphorus and no sulfur.
c. dna contains sulfur and little phosphorus.
d. proteins contain sulfur and little phosphorus.

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.