Hershey & Chase

In the mid-twentieth century, scientists were still unsure as to whether DNA or protein was the genetic material of the cell

• It was known that some viruses consisted solely of DNA (state what DNA is coated) and could transfer their genetic material into hosts?
• In 1952, Alfred Hershey and Martha Chase conducted a series of experiments to prove what?
• The viruses were then allowed to infect a bacterium called?
• The bacterial pellet was found to be what?

Summary of the Hershey-Chase Experiment

Structure of DNA

• Rosalind Franklin and Maurice Wilkins used a method of what to investigate the structure of DNA?

Summary of the Process of X-Ray Crystallography

• From the scattering pattern produced by a DNA molecule, certain inferences could be made about its structure: Open for question. See the image below (Photo 51) for the image you'll be explaining

Photo 51 – Evidence for the Structure of DNA via X-Ray Diffraction

Overview:

Helix:

Twists: