Discovery of the Genetic Material

Which scientist produced critical X-ray images that contributed to the discovery of DNA's structure?

• Erwin Chargaff

• Frederick Griffith

• Rosalind Franklin

• Gregor Mendel

What did Hershey and Chase conclude from their experiment?

• Protein is the molecule of inheritance

• DNA is the molecule of inheritance

• Both protein and DNA are molecules of inheritance

• Neither protein nor DNA is the molecule of inheritance

Which sugar is present in RNA (ribonucleic acid)?

• Ribose

• Glucose

• Deoxyribose

• Fructose

Which base is not found in DNA but is present in RNA?

• Uracil (U)

• Adenine (A)

• Thymine (T)

• Cytosine (C)

Franklin's famous X-ray image is known as _________.

• Photo 51

• Photo 21

• Photo 101

• Photo X

What did Franklin's Photo 51 reveal about the structure of DNA?

• DNA is a single strand

• DNA is a double helix

• DNA is a triple helix

• DNA is a circular molecule

Watson and Crick proposed that the structure of DNA is:

• a double helix

• a single strand

• a triple helix

• a circular molecule

Which scientist's X-ray diffraction image did Watson and Crick study to help propose their DNA model?

• Albert Einstein

• Rosalind Franklin

• Gregor Mendel

• Charles Darwin

Fill in the blank: The two outer strands of the DNA helix are made of alternating _______ (deoxyribose) and phosphate groups.

• sugar

• amino acids

• lipids

• nucleotides

Which of the following forms the backbone of the DNA molecule?

• Nitrogen bases

• Sugar-phosphate groups

• Hydrogen bonds

• Proteins