First slide

The Search for Genetic Material

Question

Viruses of bacteria grown in the presence of radioactive phosphorus contained:

Easy

A

Radioactive DNA
B

Radioactive protein
C

Radioactive lipids
D

Radioactive polysaccharides

Solution

Viruses of bacteria grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not. Similarly, viruses grown on radioactive sulfur contained radioactive protein but not radioactive DNA because DNA does not contain sulfur.

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