DNA History Daily

In 1928, when Frederick Griffith mixed a harmless R strain of pneumococcal bacteria with a heat killed deadly R strain and injected a mouse, he expected the mouse to die due to the belief that dead bacteria could give their deadly traits to living bacteria.

• True

• False

Which of the following enzymes destroys a specific type of molecule?

• Protease

• RNAse

• DNAse

• All options

In 1944, when Oswald Avery injected a mouse with the mixture of bacteria strains that Griffith used which was treated with a molecule destroying enzyme, which treatment was expected to keep the mouse alive? It was believed at the time that proteins contained the genetic code.

• Protease

• RNAse

• DNAse

• None of the options

Proteins are made with the element sulfur and DNA is made with phosphorus. If DNA is the molecule being passed on by viruses to carry their genetic instructions, which radioactive element should Alfred Hershey and Marty Chase expect to see in a second generation of viruses in their 1952 experiment?

• Sulfur

• Phosphorus

• Both

• Neither

Discovered in 1950, Chargaff’s Rule for the structure of DNA states

• There are more purines than pyrimidines

• There are more pyrimidines than purines

• There are equal amounts of purines and pyrimidines

• There are only purines

In the early 1950s, Rosalind Franklin used x-ray crystallography to discover which of the following?

• Dimension of the DNA strand

• Phosphates on the outside

• The shape is a helix

• The exact chemical structure

In 1953, James Watson and Francis Crick used Rosalind Franklin’s image of the structure of DNA to build the first exact model of the atomic structure of DNA.

• True

• False

Who is responsible for producing this image?

• Francis Crick
• James Watson
• Rosalind Franklin
• Watson and Crick

What does this image show?

• Double helical structure of DNA
• Triple Helical Structure of DNA
• Double helical structure of RNA
• Triple Helical Structure of RNA

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How did Rosalind Franklin's photo 51 affect the work of Watson and Crick?

• It was used to determine the physical structure of DNA
• It was used to identify the four bases that make up DNA
• It was used to determine the theory of independent assortment
• It was used to show DNA was the molecule of inheritance

Tags

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