IB Biology HL A1.2.14 Hl Hershey Chase Experiment Questions

Practise IB Biology HL A1.2.14 by interpreting radioactive-label and centrifugation data to evaluate DNA as genetic material.

Exam points

Explain how ³²P labels DNA and ³⁵S labels protein in bacteriophage experiments.
Interpret centrifugation and isotope-distribution data to identify which labelled material enters bacteria.
Evaluate Hershey–Chase evidence that DNA, rather than protein, is the genetic material.

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Study A1.2.14 (HL)—Hershey-Chase experiment conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The Hershey and Chase experiment supported DNA as the hereditary material.

Describe the experiment.

a. radioactive isotopes used to label viruses/bacteriophages/phages

b. proteins labelled with radioactive sulphur ${ }^{35} \mathrm{~S}$ and DNA labelled with radioactive phosphorous ${ }^{32} \mathrm{P}$

c. phage infects bacterium

d. only viral DNA enters bacterium «viral coat/capsid/shell do not»

e. parts of phage remaining outside bacterial cell are removed OR

bacteria are separated from phage parts «by centrifuge»

f. bacteria contain the labelled/radioactive DNA

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IB Biology HL A1.2.14 Hl Hershey Chase Experiment Questions question 1