Lesson 5 (Genetics)

Who proposed the double-helical model for the structure of DNA?

• Erwin Chargaff

• Frederick Griffith

• Alfred Hershey and Martha Chase

• James Watson and Francis Crick

What is the most celebrated molecule of our time?

• Carbohydrate

• Protein

• RNA

• DNA

What is the substance of inheritance?

• Protein

• RNA

• DNA

• Carbohydrate

Who first worked out the role of DNA in heredity by studying bacteria and viruses?

• Alfred Hershey and Martha Chase

• Frederick Griffith

• Erwin Chargaff

• James Watson and Francis Crick

What is the phenomenon called when a cell changes in genotype and phenotype due to the assimilation of external DNA?

• Transformation

• Replication

• Mutation

• Transcription

Who performed experiments showing that DNA is the genetic material of a phage known as T2?

• James Watson and Francis Crick

• Frederick Griffith

• Alfred Hershey and Martha Chase

• Erwin Chargaff

What did Alfred Hershey and Martha Chase use to trace the fates of the protein and DNA of T2 phages?

• Radioactive potassium and calcium

• Radioactive sulfur and phosphorus

• Radioactive carbon and oxygen

• Radioactive nitrogen and hydrogen

What did Erwin Chargaff report in 1947?

• That DNA composition varies from one species to the next

• That DNA composition is the same in all species

• That DNA is not the genetic material

• That DNA is composed of three components

Who produced a picture of the DNA molecule using X-ray crystallography?

• Maurice Wilkins

• Rosalind Franklin

• Francis Crick

• James Watson

What did Watson and Crick deduce about the structure of DNA?

• It is a quadruple helix

• It is a triple helix

• It is a single helix

• It is a double helix