McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

What did Hershey and Chase set out to determine with their experiment as illustrated here?

A. whether protein or DNA was the genetic material for viruses
B. whether viruses could be labeled using radioactive isotopes
C. whether viruses could be broken down into their component parts
D. whether viruses were infective without their protein coats

2. Why was it useful to radioactively label DNA with ³²P and the viral protein coat with ³⁵S?

A. Labeling the compounds this way enabled Hershey and Chase to trace the roles of these compounds throughout the experiment.
B. Hershey and Chase were able to show that only viral DNA entered a cell during infection.
C. Protein contains sulfur but not phosphorus, and DNA contains phosphorus but no sulfur.
D. All of these are correct.

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