DNA Structure and Replication problems
- 1. The DNA polymerase in bacteria, responsible for DNA synthesis is
Options- A. Polymerase I
- B. Polymerase II
- C. Polymerase III
- D. all of these Discuss
Correct Answer: Polymerase III
- 2. Which of the following are short nucleotides strands made by DNA polymerase working in the opposite direction of the replication fork?
Options- A. Leading strands
- B. Okazaki fragments
- C. Primers
- D. Lagging strand Discuss
Correct Answer: Okazaki fragments
- 3. DNA replication results in
Options- A. two completely new DNA molecules
- B. two DNA molecules such that each one contains a strand of the original
- C. one new DNA molecules 1 old molecule
- D. one new molecule of RNA Discuss
Correct Answer: two DNA molecules such that each one contains a strand of the original
- 4. Which of these drugs bind to DNA and cuts it, producing hydroxyl radicals?
Options- A. Bleomycin
- B. Erythromycin
- C. Tunicamycin
- D. All of these Discuss
Correct Answer: Bleomycin
- 5. The RNA primers used to initiate replication in E. coli
Options- A. result in Okazaki fragments on leading strand
- B. are removed by Pol I
- C. are joined together by DNA ligase
- D. are removed by helicase + ATP Discuss
Correct Answer: are removed by Pol I
- 6. What is the IUPAC code for an A, C, T ambiguity in a nucleic acid sequence?
Options- A. B
- B. H
- C. S
- D. None of these Discuss
Correct Answer: H
- 7. There is a single origin for DNA replication in bacteria. How many origins of replication are found in the much larger genomes of eukaryotes such as mammals?
Options- A. One
- B. About 100
- C. Thousands and tens of thousands
- D. none of these Discuss
Correct Answer: Thousands and tens of thousands
- 8. An enzyme that recognizes foreign DNA, and results in a cut in that DNA is called
Options- A. transposase
- B. helicase
- C. reverse transcriptase
- D. restriction endonuclease Discuss
Correct Answer: restriction endonuclease
- 9. The size of a linear DNA fragment in a gel can be estimated by
Options- A. fluorescence in UV light
- B. the sedimentation coefficient
- C. the time it takes the gel to run
- D. comparison with a molecular weight standard such as Hind III digested phage lambda Discuss
Correct Answer: comparison with a molecular weight standard such as Hind III digested phage lambda
- 10. Which of the following is an active site on its single polypeptide chain for DNA Polymerase I?
Options- A. 5' ? 3' polymerase
- B. 3' ? 5' exonuclease
- C. 5' ? 3' exonuclease
- D. all of the above Discuss
Correct Answer: 5' ? 3' polymerase
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