Semiconservative replication
During the S-phase, the DNA content of the cell is replicated in preparation for the upcoming cell division. The DNA first has to be despiralized, formig the replication fork, so that one of the strands can serve as the template for synthesis. The enzyme primase synthetizes small RNA sequences, which are later enzymatically connected by the ligase. The term semiconservative replication is used because the replicated DNA consists of one old and one newly synthetized strand.