DNA Replication Quiz Answers

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What is the function of DNA polymerase I?

• To remove RNA primers and replace them with the correct nucleotides.
• To remove RNA primers and replace them with the correct nucleotides and check replicated DNA and replace incorrect nucleotides.
• To replicate a strand of DNA by adding nucleotides.
• To check replicated DNA and replace incorrect nucleotides.

One strand contains Okazaki fragments, what strand is it?

• The lagging strand.
• The leading strand.
• Both the leading strand and the lagging strand.
• Neither.

What allows DNA replication to occur so quickly?

• Okazaki fragments.
• DNA polymerase I and III.
• Replication bubbles.
• All of the above.

DNA replication is...

• Bidirectional.
• Semiconservative.
• Bidirectional and semiconservative.
• Neither.

What direction does it occur in?

• 3' to 5'
• 5' to 3'
• Depends if it is on the leading strand or the lagging strand.
• None of these answers are correct.

What starts the DNA replication process?

• DNA polymerase III splits the DNA strand and then adds the appropiate bases to the new strands.
• When the enzyme helicase breaks apart the hydrogen bonds on the original DNA strand.
• When RNA primers attach to the strand and prepare for the entery of the helicase enzyme.
• The DNA strand splits apart when ready for replication and RNA primers attach to the strands.

What is the purpose of the enzyme, DNA ligase?

• To aid in the placement of nucleotide bases.
• To break apart the strands of the parent DNA.
• To anneal the DNA strands after replication.
• To form a phosphodiester bond joining Okazaki fragments.

DNA replication occurs when...

• Gyrase splits the DNA strand and DNA polymerase III adds nucleotides using RNA primers as the starting points.
• DNA polymerase I splits the DNA strand into two and uses primase to add nucleotides.
• Helicase splits the DNA strand and DNA polymerase III adds nucleotides using RNA primers as the starting points.
• Primase adds RNA primers which enables the helicase to split apart the strand and allows DNA polymerase III to add nucleotides in a 5' to 3' direction.

What is gyrase?

• A general enzyme that is used to reduce the strain on the DNA when unwinding.
• An enzyme that is used in bacteria to split apart the DNA strand.
• An enzyme that is used to aid helicase in the splitting of DNA.
• An enzyme that is used in bacteria to reduce the strain on the DNA strands when unwinding.

In what way does the leading strand travel? What way does the lagging strand travel?

• The leading strands travel away from the replication fork in a 3' to 5' direction while the lagging strands travel towards the replication fork in a 3' to 5' direction.
• The leading strands travel towards the replication fork in a 3' to 5' direction while the lagging strands travel away from the replication fork in a 3' to 5' direction.
• The leading strands travel towards the replication fork in a 5' to 3' direction while the lagging strands travel away from the replication fork in a 5' to 3' direction.
• The leading strands travel away from the replication fork in a 5' to 3' direction while the lagging strands travel towards the replication fork in a 5' to 3' direction.

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