Chapter 14: Q. 9 (page 367)
Meselson and Stahl's experiments proved that DNA replicates by which mode? a. conservative b. semi-conservative c. dispersive d. none of the above
Option b is correct.
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Describe the structure and complementary base pairing of DNA
How did Meselson and Stahl support Watson and Crick’s double-helix model? a. They demonstrated that each strand serves as a template for synthesizing a new strand of DNA.
b. They showed that the DNA strands break and recombine without losing genetic material.
c. They proved that DNA maintains a double-helix structure while undergoing semi-conservative replication.
d. They demonstrated that conservative replication maintains the complementary base pairing of each DNA helix.
When Chargaff was performing his experiments, the tetranucleotide hypothesis, which stated that DNA was composed of GACT nucleotide repeats, was the most widely accepted view of DNA’s composition. How did Chargaff disprove this hypothesis?
You isolate a cell strain in which the joining of Okazaki fragments is impaired and suspect that a mutation has occurred in an enzyme found at the replication fork. Which enzyme is most likely to be mutated.
An adult with a history of tanning has his genome sequenced. The beginning of a protein-coding region of his DNA reads ATGGGGATATGGCAT. If the protein-coding region of a healthy adult reads ATGGGGATATGAGCAT, identify the site and type of mutation.
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