Exam 12: Dna Structure, Replication, and Organization

Suppose that DNA repair enzymes cut out part of a DNA strand that had an incorrect nucleotide. Which two enzymes are needed to complete the repair?

Which of the following nucleotide sequences represents the complementary sequence that would bind to the DNA strand 5'-GACGTT-3'?

Which type of molecule was the ³²P used to label in the Hershey Chase experiment?

What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S strain Streptococcus pneumoniae bacteria?

Acyclovir is a chemical analogue of a DNA nucleoside that is used to treat people who are infected by herpes simplex viruses (HSV). How does acyclovir work as a treatment without harming the patient?

Who was first scientist to identify and characterize DNA?

From his work with Streptococcus pneumoniae bacteria, Griffith described the transforming principle. What did this principle prove to be?

-The electron micrograph in the figure shows chromatin organized like beads on a string. Which histone protein is usually associated with the "string" portion?

Why do many antiviral drugs resemble nucleotides?

For which discovery are Watson and Crick famous?

-What type of condensed DNA are Barr bodies (inactivated X chromosomes) composed of?

Prior to 1940, which type of molecule did scientists consider to be the best candidate for the genetic material?

Which sentence describes the width of a DNA double helix?

The figure depicts the results of an experiment to determine how DNA replication occurs. What is the apparent composition of each DNA molecule after replication?

What catalyzes the unwinding of the DNA double helix during DNA replication?

Match each researcher or set of researchers with the discovery or experiment each is associated with. -showed that DNA is the transforming principle, from heat-killed S strain Streptococcus pneumoniae that can make the R strain virulent

Which nitrogenous bases are considered pyrimidines?

What would be the error rate in DNA replication if the proofreading ability of DNA polymerase were to be removed?

If protein was the genetic material, where in the Hershey and Chase experiment would you expect to find radioactivity when phage contained ³⁵S-labelled protein?

Suppose that the DNA of an organism is studied and found to contain 14% guanine. What percentage of thymine would you expect to find?