Contributions to DNA Discovery

The video explores the history of DNA discovery, starting with Frederick Neicher's isolation of nucleic acid, Griffith's bacterial transformation experiments, and Avery's identification of DNA as the genetic material. It covers Hershey and Chase's virus studies, Chargaff's base pairing rules, and Watson and Crick's double helix model, highlighting key contributions and the eventual recognition of DNA's structure.

Who first isolated the substance later known as nucleic acid?

• Oswald Avery

• Richard Altman

• Frederick Neicher

• Phoebus Levine

What did Frederick Griffith's experiment demonstrate?

• Viruses replicate using RNA

• DNA is the genetic material

• Proteins are the genetic material

• Traits can be transferred between bacterial strains

What did Oswald Avery's experiments conclude?

• Lipids are responsible for genetic transformation

• Proteins are responsible for genetic transformation

• DNA is responsible for genetic transformation

• RNA is responsible for genetic transformation

What was the key finding of the Hershey-Chase experiment?

• Proteins carry genetic information

• DNA carries genetic information

• RNA carries genetic information

• Lipids carry genetic information

Which scientist was not recognized with a Nobel Prize despite significant contributions to the Hershey-Chase experiment?

• Max Delbrück

• Martha Chase

• Alfred Hershey

• Salvatore Luria

What did Erwin Chargaff discover about DNA?

• DNA is composed of proteins

• DNA is a triple helix

• The amount of adenine equals thymine, and cytosine equals guanine

• DNA is a single helix

What was Linus Pauling's incorrect model of DNA?

• Single helix

• Triple helix

• Quadruple helix

• Double helix

What did Rosalind Franklin's X-ray diffraction images reveal about DNA?

• DNA is a single helix

• DNA is a double helix

• DNA is a triple helix

• DNA is a quadruple helix

Who were awarded the Nobel Prize for the discovery of the DNA double helix structure?

• Crick, Franklin, and Wilkins

• Watson, Crick, and Franklin

• Watson, Crick, and Wilkins

• Watson, Franklin, and Wilkins

Which scientist's contributions were not recognized with a Nobel Prize due to their untimely death?

• Maurice Wilkins

• Rosalind Franklin

• Francis Crick

• James Watson