Problem:
Hershey and Chase showed that when phages were labeled with 32P and 35S, the 35S remained outside the cell and could be removed without affecting the course of infection, whereas the 32P entered the cell and could be recovered in progeny phages.
What distribution of isotope would you expect to see if parental phages were labeled with isotopes of
a. C?
b. N?
c. H?
Based upon your answers, explain why Hershey and Chase used isotopes of phosphorous and
Sulfur in their experiments.