Chapter 13 DNA (M&L 2020) ks2021

What is the chronological order of the important discoveries in the structure of DNA?

• Franklin makes an X-ray diffraction photo of DNA->Chargaff's ratios of nucleotides-->Watson and Crick identify the double helix

• Franklin makes an X-ray diffraction photo of DNA->Watson and Crick identify the double helix->Chargaff's ratios of nucleotides

• Chargaff's ratios of nucleotides->Franklin makes an X-ray diffraction photo of DNA->Watson and Crick identify the double helix

• Chargaff's ratios of nucleotides->Watson and Crick identify the double helix->Franklin makes an X-ray diffraction photo of DNA

Griffith’s experiments advanced the study of genetics by proving that

• genetic information can be passed from parents to their offspring during sexual reproduction.

• the bacteria that can make mice sick are the same bacteria that can be grown in culture dishes in a laboratory.

• there is a chemical that contains genetic information that can be passed from one organism to another.

• bacteria can make people sick by infecting them with a chemical that contains genetic information.

Which bacteria killed the mice in Griffith’s transformation experiment?

• live, harmless bacteria and heat-killed, harmful bacteria

• live, harmless bacteria and heat-killed, harmless bacteria

• live harmful bacteria and heat-killed, harmless bacteria

• live harmless bacteria, and live, harmful bacteria

What property of DNA does bacterial transformation illustrate?

• Bacterial DNA is found in a circular chromosome.

• Bacterial DNA cannot move into other bacteria and function.

• Bacterial DNA can move into another bacteria and function.

• Bacterial DNA uses four nucleotides bases that work in pairs.

What did Avery conclude caused transformation?

• A lipid was the transforming factor.

• A carbohydrate was the transforming factor.

• A protein was the transforming factor.

• DNA was the transforming factor.

What would have happened if Avery had added an enzyme that digested all the nucleic acids to the mixture of heat-killed bacteria, added the mixture to harmless bacteria, and injected the mixture into mice?

• The harmless bacteria would have been transformed, and the mice would have lived.

• The harmless bacteria would not have been transformed, and the mice would have died.

• The harmless bacteria would not have been transformed, and the mice would have lived.

• The harmless bacteria would have been transformed, and the mice would have died.

What do bacteriophages infect?

• bacteria

• humans

• mice

• viruses

Why did Hershey and Chase label the viral DNA with radioactive phosphorous and not radioactive sulfur?

• Proteins acids contain sulfur and little phosphorous.

• DNA contains sulfur and little phosphorous.

• Proteins contain phosphorus and no sulfur.

• DNA contains phosphorus and no sulfur.

Which part of the bacteriophage in the figure contains genetic material?

• A

• B

• C

• D

Rosalind Franklin contributed to the understanding of DNA by

• producing images of DNA molecules using X-rays.

• figuring out that DNA strands form a double helix.

• conducting experiments that showed which nucleotides are complementary.

• finding that DNA was a nucleic acid made up of a long chain of individual nucleotides.