is it ligase, okazaki fragments, polymerase, or helicase?
-
Each strand of DNA has two ends. One is known as the 5'end, whilst the other is known as the 3' end. DNA replication always occurs in the 5' to 3' direction, however as the two DNA strands run in opposite directions only one strand can be replicated contiguously in that direction. For this reason short sections of DNA are constructed 5' to 3' on the lagging strand. Then the enzymes wait until the DNA has unwound a bit more, then they construct another fragment. These are known as Okazaki fragments.
-
Okazaki fragments. The other answers are proteins.