SG 4.2

Question 1

Order of events of replication

Answer 1

1. Helicase
2. Primase
3. DNA polymerase III
4. DNA polymerase I
5. Ligase

Question 2

Antiparallel

Answer 2

nucleotides have to be added in OPPOSITE directions on the two parent strands

Question 3

Leading strand

Answer 3

DNA polymerase moving TOWARDS the replication fork, and so can copy CONTINUOUSLY

Question 4

Lagging strand

Answer 4

DNA polymerase moving AWAY from the replication fork, meaning copying is DISCONTINUOUS

Question 5

DNA polymerase III

Answer 5

• main DNA builder
• 1000 bases/sec