Enzymes
Steps of DNA Replication
Vocabulary
100

What does DNA Ligase do?

Connects the Okazaki fragments in the lagging strand

100

What happens after the Helicase breaks the hydrogen bonds?

Single Stranded Proteins hold the two strands separately

100

What is RNA primer

An RNA nucleotide used to anchor the DNA strand to parental strand and used to start the DNA replication

200

What does DNA polymerase III do?

Adds nucleotides starting from the RNA primer

200

What happens after the replication bubble is formed at the Origin of Replication?

Topoisomerase binds to the DNA strand

200
What is the Replication Fork?

The separation of the strands after the hydrogen bonds are broken by helicase

300

What does RNA Primase do?

Adds the RNA primer at the start of replication

300

What happens after Single Stranded Proteins separate the strands?

RNA primase attaches an RNA primer to the two strands

300

What is the Origin of Replication

Area in DNA where replication will begin

400

What does Topoisomerase do?

Controls the rate of winding and unwinding of the strand

400

After Exonuclease what happens?

DNA Polymerase I places DNA nucleotides where the RNA primer was originally

400

What is the Leading Strand

3' --> 5' of the parent strand or 5'-3' of daughter strand. One continuous strand of DNA is formed.

500

What does Exonuclease do? (Two things)

Removes the RNA primers AND any incorrect base pairs

500

For the lagging strand, what happens after DNA polymerase III is done adding nucleotides?

Exonuclease removes the RNA primers and any incorrect DNA base pairs

500
What is the Sliding Clamp

The sliding clamp pushes or moves DNA polymerase III along the DNA template strand

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