6 Questions
What did Frederick Griffith's experiment demonstrate?
DNA was the genetic material transferred between bacteria.
Who concluded that DNA was the genetic material being transferred between bacteria?
Oswald Avery
What did Erwin Chargaff notice about DNA's nitrogen bases in his 1950 experiment?
Equal amounts of adenine and thymine
What type of virus infects bacteria?
Bacteriophage
In Hershey & Chase's experiment, what was identified as the genetic material passed from virus to bacteria?
DNA
What term describes the process where harmless R cells were transformed by material from dead S cells?
Transformation
Study Notes
- In 1928, Frederick Griffith conducted an experiment with bacteria and mice, where he observed that a harmless strain of bacteria (R) became harmful when mixed with the remains of a heat-killed harmful strain (S).
- Griffith's experiment demonstrated transformation, but he did not know what material was responsible for the transfer of traits.
- In 1944, Oswald Avery repeated Griffith's experiments and concluded that genetic material was the substance responsible for the transformation.
- Erwin Chargaff, in 1950, discovered that DNA contained equal amounts of adenine and thymine, as well as equal amounts of cytosine and guanine.
- In 1952, Hershey and Chase conducted an experiment with bacteriophages and confirmed that DNA, not protein, was the genetic material passed from the virus to the bacteria.
Test your knowledge on the landmark experiment conducted by Frederick Griffith in 1928, where he observed transformation in bacteria. Learn about the significance of his findings and the material responsible for transforming harmless cells into deadly ones.
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