Historical Basis of Modern Understanding

Free Response

Explain Griffith's transformation experiments. What did he conclude from them?


Live R cells acquired genetic information from the heat-killed S cells that “transformed” the R cells into S cells.

Why were radioactive sulfur and phosphorous used to label bacteriophage in Hershey and Chase's experiments?


Sulfur is an element found in proteins and phosphorus is a component of nucleic acids.