Frederick Griffith did experiments on genetic transformation. Which of the following statements about his experiments is accurate?
a. Griffith used only pathogenic bacteria in his experiments.
b. The combination of living nonencapsulated bacteria and heat-killed encapsulated bacteria did not cause disease.
c. Griffith used bacteria in which the nonpathogenic strain was encapsulated but the pathogenic strain was not.
d. Griffith found that DNA released from dead (virulent) bacteria entered live (avirulent) bacteria and changed them genetically, causing them to become virulent.
Ans: d. Griffith found that DNA released from dead (virulent) bacteria entered live (avirulent) bacteria and changed them genetically, causing them to become virulent.
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