DNA History & Structure

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Presentation transcript:

DNA History & Structure AP Biology DNA History & Structure

Nucleic Acid Structure

Complimentary Base Pairing

Frederick Griffith

Frederick Griffith Experiment Mixture of heat-killed S cells and living R cells Living S cells (control) Living R cells (control) Heat-killed S cells (control) RESULTS Mouse dies Mouse healthy Mouse healthy Mouse dies Living S cells are found in blood sample

Oswald Avery

Alfred Hershey & Martha Chase

Bacteriaphage injecting it’s DNA into a bacterial cell

Electron Microscope View

Hershey – Chase Experiment

Erwin Chargaff

Adenine = Thymine (DNA) or Uracil (RNA) Chargaff’s Rule Adenine = Thymine (DNA) or Uracil (RNA) & Guanine = Cytosine If you know the % composition of 1, you can find the % composition of the other 3.

Rosalind Franklin

DNA from a top view

DNA from a side view

James Watson & Francis Crick with their DNA model

See the HYDROGEN bonds?

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