dna-replication microbiology question and answers -Page 2

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DNA Replication problems

1. DNA gyrase is inhibited by
Options
A. tetracycline
B. nalidixic acid
C. both (a) and (b)
D. cephalosporin

Correct Answer: nalidixic acid

2. 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

Correct Answer: DNA ligase

3. 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

4. Both strands of DNA serve as templates concurrently in
Options
A. replication
B. excision repair
C. mismatch repair
D. none of these

Correct Answer: replication

5. 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

Correct Answer: All of the above

First 2

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