Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur?

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 phosphorous.
d. Proteins acids contain sulfur and little phosphorous.


Answer: a. DNA contains phosphorus and no sulfur.


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