Question

question 10 of 10 alfred hershey and martha chase studied how a virus infects bacterial cells by attaching to the cells. they knew the virus was made mostly of proteins and dna. they labeled the proteins with radioactive sulfur. they labeled the dna with radioactive phosphorus. the diagram below shows hershey and chases experimental setup. experiment 1 experiment 2 radioactive viral dna radioactive viral protein virus virus bacteria bacteria mix in a flask, blend, and then separate with a centrifuge. mix in a flask, blend, and then separate with a centrifuge. fluid (lighter viruses) pellet (heavier bacteria) fluid (lighter viruses) pellet (heavier bacteria) how did hershey and chase determine that viral proteins do not carry genetic information? a. they found radioactive sulfur in the fluid. b. they found radioactive phosphorus in both the pellet and the fluid. c. they found radioactive sulfur in the bacterial pellet. d. they found that the radioactive phosphorus disappeared in the centrifuge.

Explanation:

Step1: Understand the labeling

Proteins were labeled with radioactive sulfur.

Step2: Analyze the experiment setup

Viruses with labeled proteins were mixed with bacteria, then blended and centrifuged.

Step3: Determine the result

If proteins carried genetic info, radioactive sulfur would be in the bacterial pellet. But it was in the fluid, showing proteins do not carry genetic info.

Answer:

A. They found radioactive sulfur in the fluid.