Discussion
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- Question
In E.coli, which enzyme synthesizes the RNA primer for Okazaki fragments?
Options- A. DnaA
- B. DnaC
- C. DnaG
- D. all of these
- Correct Answer
- DnaG
- 1. Which of the following repairs nicked DNA by forming a phosphodiester bond between adjacent nucleotides?
Options- A. Helicase
- B. DNA gyrase
- C. Topoisomerases
- D. DNA ligase Discuss
- 2. DNA gyrase is inhibited by
Options- A. tetracycline
- B. nalidixic acid
- C. both (a) and (b)
- D. cephalosporin Discuss
- 3. Which of the following statements on replication in E.coli is correct?
Options- A. It occurs in a unidirectional manner
- B. It occurs in bidirectional manner
- C. Always uses T7 DNA polymerase when infected by T7 phage
- D. Occurs only when ? phase has infected E. coli Discuss
- 4. The synthesis of DNA by DNA polymerase occurs in the
Options- A. 3' to 5' direction
- B. 5' to 5' direction
- C. 5' to 3' direction
- D. 3' to 3' direction Discuss
- 5. DNA replication rates in prokaryotes are approximately of the order of
Options- A. 10 bases per second
- B. 1,00 bases per second
- C. 1,000 bases per second
- D. 10,000 bases per second Discuss
- 6. Both strands of DNA serve as templates concurrently in
Options- A. replication
- B. excision repair
- C. mismatch repair
- D. none of these Discuss
- 7. Which of the following lacks 3'-5' exonuclease activity?
Options- A. Short fragment of DNA polymerase I
- B. Taq DNA polymerase
- C. T4 DNA ligase
- D. All of the above Discuss
- 8. The interaction between the mRNA and tRNA determined the position of amino acid in a polypeptide sequence. This is called the
Options- A. stagerivity
- B. Wobble hypothesis
- C. promiscuity
- D. adaptor hypothesis Discuss
- 9. What is the direct cause of cell death by diphtheria toxin?
Options- A. Formation of an ion channel in the cell membrane
- B. Inactivation of a translational elongation factor
- C. Induction of apoptosis
- D. None of the above Discuss
- 10. When was the genetic code completed?
Options- A. 1958
- B. 1952
- C. 1966
- D. 1968 Discuss
DNA Replication problems
Search Results
Correct Answer: DNA ligase
Correct Answer: nalidixic acid
Correct Answer: It occurs in bidirectional manner
Correct Answer: 5' to 3' direction
Correct Answer: 1,000 bases per second
Correct Answer: replication
Correct Answer: All of the above
Correct Answer: adaptor hypothesis
Correct Answer: Inactivation of a translational elongation factor
Correct Answer: 1966
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