History of Genetics Discovery
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Questions and Answers

What was Griffith's surprising observation in his experiment?

  • The disease-causing bacteria were not found in the lungs of the injected mice.
  • The heat-killed, S-type bacteria transformed into live, disease-causing bacteria. (correct)
  • The mice developed pneumonia and died after being injected with harmless bacteria.
  • The injected mice were completely immune to any form of bacteria.
  • What did Griffith conclude was responsible for changing harmless bacteria into disease-causing ones?

  • Mixing two types of bacteria caused an explosion in the laboratory mice.
  • The mice developed immunity to all forms of bacterial infections.
  • Information contained in the heat-killed, S-type cells passed onto the living R-type cells. (correct)
  • A chemical compound transferred from live, harmless bacteria to heat-killed, S-type bacteria.
  • Why did Griffith refer to the process as 'transformation'?

  • The chemical compound was transformed into a gene during the experiment.
  • Harmless bacteria were permanently changed into disease-causing ones. (correct)
  • The mice were transformed into a different species after being injected.
  • The live, harmless bacteria transformed into heat-killed, S-type bacteria.
  • Why did Griffith conclude that the transforming factor had to be a gene?

    <p>The offspring of the transformed bacteria inherited the ability to cause disease.</p> Signup and view all the answers

    What was Griffith's main inference about how the disease-causing ability passed from heat-killed bacteria to harmless ones?

    <p>The chemical compound contained information that permanently changed harmless bacteria.</p> Signup and view all the answers

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