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DNA Replication


This quiz is based on the process of DNA replication in both Prokaryotes and Eukaryotes.

Formats Info Page Worksheet / Test Paper Quiz Review
Multiple choice

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1.

In DNA, mutations at G-C sequences occur quite frequently since 5-methyl cytosine easily deaminates to form :

  Thymine

  Adenine

  Guanine

  Cytosine

  Half-n-half Clue
 

2.

The enzyme responsible for initiating the unwinding of double-stranded DNA (eliminating supercoiling) by nicking a single strand of the DNA molecule is :

  Gyrase

  Topoisomerase

  Helicase

  Ligase

  Half-n-half Clue
 

3.

An enzyme (used by all retroviruses) that transcribes genetic information of the virus from RNA into DNA, is :

  Reverse transcriptase

  RNA polymerase

  Restriction nuclease

  Methylase

  Half-n-half Clue
 

4.

A major difference between DNA replication in prokaryotes and eukaryotes is :

  DNA amylase performs the function of DNA helicase in prokaryotes

  prokaryotes do not use Topoisomerase in the replication process

  there is only one replication origin in prokaryotes.

  replication is conservative in prokaryotes

  Half-n-half Clue
 

5.

A mamalian cell typically has 1.2 meters (when completely outstretched) of double stranded DNA.The total time to duplicate the DNA is 5 hours. How many origins of replication are there if the rate of duplication is 16µmeters/min ?

  250

  15000

  1

  500

  Half-n-half Clue
 

6.

The enzyme that creates a short RNA oligonucleotide at initiation sites where replication is to be carried out is called :

  Primase

  DNA Ligase

  DNA Gyrase

  Exonuclease

  Half-n-half Clue
 

7.

The enzyme that accomplishes the unwinding of the original double stranded DNA molecule, once supercoiling has been eliminated, by breaking the hydrogen bonds that hold the two strands together is :

  DNA Polymerase II

  Topoisomerase

  Primase

  Helicase

  Half-n-half Clue
 


 
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