DNA Structure and Replication problems
- 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
Correct Answer: It lacks a proofreading exonuclease
- 2. 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 Discuss
Correct Answer: solenoid
- 3. 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
Correct Answer: 20 to 30%
- 4. 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
Correct Answer: Lagging strand, ligase
- 5. 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
Correct Answer: DNAb, gyrase
- 6. 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
Correct Answer: below DNA containing 14N
- 7. Which enzyme catalyzes the elongation of DNA molecules?
Options- A. DNA polymerase
- B. Helicase
- C. DNA ligase
- D. Primase Discuss
Correct Answer: DNA polymerase
- 8. Deoxyribonucleoside triphosphates, being need in the chain termination methods are
Options- A. dATP
- B. dGTP and dCTP
- C. dTTP
- D. all of these Discuss
Correct Answer: all of these
- 9. Reverse transcriptase produces
Options- A. DNA from peptides
- B. RNA from DNA
- C. RNA from RNA
- D. DNA from RNA Discuss
Correct Answer: DNA from RNA
- 10. Without telomerase, what would happen to the ends of chromosomes after each round of replication?
Options- A. Chromosomes would become progressively shorter
- B. Nothing would happen
- C. Chromosomes would get longer
- D. none of the above Discuss
Correct Answer: Chromosomes would become progressively shorter
More in Biochemistry:
Programming
Copyright ©CuriousTab. All rights reserved.