Question

Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur?
DNA contains phosphorus and no sulfur.
Proteins contain phosphorus and no sulfur.
DNA contains sulfur and little phosphorus.
Proteins contain sulfur and little phosphorus

Answer 1

DNA contains phosphorus and no sulfur.

Answer 2

Radioactive sulfur-35 was used to label the protein sections of the T2 phage, because sulfur is contained in amino acids but not in DNA