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Question

The scientists also examined the new bacteriophages produced after infection Based on the graph, which isotope(s), if any, appeared in these new bacteriophages?

In 1952. Allred Hershey and Martha Chase conducted an experiment about bacteriophage reproduction. They inserted a phosphorous isotope (P) into the bacteriophages DNA and a sullur isotope (S) into a protein in the bacteriophages capsids Hershey and Chase then infected bacteria with the bacteriophages. After Infection, they put the bacteria in a blender to separate the cells from the extracellular matter. They measured the percentage of isotopes that remained in the extracellular matter The results are in the graph below

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0 1

extracellular S

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(1 point)

Ono isotopes

Osulfur isotopes

phosphorous isotopes

both sulfur and phosphorous isotopes

percent of total isotope

extracellular p

78

running time in blender (min)

Answer 1

Based on the graph, the new bacteriophages did not contain any sulfur isotopes. Therefore, only phosphorous isotopes appeared in the new bacteriophages.