| A | B |
| helicase | unwindes DNA during replication |
| RNA primase | provides a free 3' end for polymerase to add on to |
| RNA primer | small piece of RNA 10 nt long that begins DNA replication |
| single strand binding protein | binds to DNA to hold two strands apart |
| DNA polymerase | synthesizes new strand of DNA during replication |
| DNA replication | the process by which DNA is duplicated |
| nucleus | the site of DNA replication |
| replication bubble | areas of unwound DNA undergoing replication |
| replication fork | one half of a replication bubble |
| Okazaki framents | short pieces of DNA replicated with the lagging strand as a template |
| leading strand | the strand of DNA synthesized in the same direction the replication fork is moving |
| DNA ligase | joins two strands of DNA together |