Discussion
Home ‣ Biochemistry ‣ DNA Structure and Replication Comments
- Question
30 nm wide helix with five or six nucleosomes per helix is known as
Options- A. solenoid
- B. halonoid
- C. kinoplast
- D. none of these
- Correct Answer
- solenoid
- 1. The rapid appearance of HIV-1 strains that are resistant to AIDS drugs is due in part to which of the following property of its reverse transcriptase?
Options- A. AZT (zidovudine) is too expensive to be taken in effective doses
- B. The RNase H domain of p66 causes error prone synthesis
- C. It lacks a proofreading exonuclease
- D. It has low affinity for the correct dNTP's Discuss
- 2. The nicks or gaps between Okazaki fragments are eventually sealed by
Options- A. gyrase
- B. DNA ligase
- C. RNA ligase
- D. polymerase Discuss
- 3. Each replication bubbles consists of
Options- A. 3 replication forks
- B. 2 replication forks
- C. 4 replication forks
- D. 1 replication forks Discuss
- 4. The packing ratio of nucleosomes is about
Options- A. 6
- B. 8
- C. 7
- D. 9 Discuss
- 5. The enzyme responsible for breaking the hydrogen bonds, and thus separating the DNA strands during DNA synthesis is
Options- A. DNA polymerase
- B. strandase
- C. helicase
- D. none of these Discuss
- 6. What is the approximate percentage of repetitive DNA sequences in human DNA?
Options- A. 10 to 20%
- B. 20 to 30%
- C. 30 to 40%
- D. 40 to 50% Discuss
- 7. Okazaki fragments occur on the __________ and are bonded together by __________
Options- A. Leading strand, polymerase
- B. mRNA, anticodons
- C. Lagging strand, ligase
- D. tRNA, polymerase Discuss
- 8. Overwinding or overtightening of DNA during replication is caused and removed by
Options- A. DNAb, DNA polymerase
- B. DNAa, gyrase
- C. DNAb, gyrase
- D. Single stranded protein, DNAa Discuss
- 9. In a cesium chloride gradient, DNA labeled with 15N and centrifuged will form a band
Options- A. above DNA containing 14N
- B. below DNA containing 14N
- C. with 14N-containing DNA
- D. all of these Discuss
- 10. Which enzyme catalyzes the elongation of DNA molecules?
Options- A. DNA polymerase
- B. Helicase
- C. DNA ligase
- D. Primase Discuss
DNA Structure and Replication problems
Search Results
Correct Answer: It lacks a proofreading exonuclease
Correct Answer: DNA ligase
Correct Answer: 2 replication forks
Correct Answer: 7
Correct Answer: helicase
Correct Answer: 20 to 30%
Correct Answer: Lagging strand, ligase
Correct Answer: DNAb, gyrase
Correct Answer: below DNA containing 14N
Correct Answer: DNA polymerase
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