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Example Questions
Example Question #21 : Nucleic Acid Synthesis
Why is topoisomerase I necessary during DNA replication?
It unwinds the DNA into two separate strands
It extends the existing chain of nucleotides one base at a time
It relieves the tension in the DNA caused by coiling and supercoiling
It creates an RNA primer to begin synthesis of the new strand of DNA
It joins together the Okazaki fragments formed in the lagging strand
It relieves the tension in the DNA caused by coiling and supercoiling
Topoisomerase I functions as a stress reliever during DNA replication. DNA coils and supercoils, and without topoisomerase, the tension caused by this winding would not be able to dissipate.
Example Question #22 : Nucleic Acid Synthesis
Which of the following is a correct match between prokaryotic DNA polymerase type and function?
DNA polymerase I - DNA repair
DNA polymerase II - DNA repair
DNA polymerase I - primary enzyme for DNA synthesis
DNA polymerase III - fills gaps in lagging strand
DNA polymerase II - primary enzyme for DNA synthesis
DNA polymerase II - DNA repair
The correct matches between prokaryotic DNA polymerase type and function are:
DNA polymerase I - fills in gaps in lagging strand
DNA polymerase II - DNA repair
DNA polymerase III - primary enzyme for DNA synthesis
Note: The functions of certain DNA polymerases in eukaryotes and prokaryotes are not the same.
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