Describe the process of DNA replication. Why is the synthesis of a DNA molecule going fragmentary, and not the entire length?

DNA replication is a key event in cell division. It is important that by the time of dividing the DNA was completely replicated and at the same time only once. This is provided by certain mechanisms of regulation of DNA replication. Replication takes place in three stages: initiation of replication; elongation; termination of replication.
Replication regulation is carried out mainly at the initiation stage. This is quite easy to do, because replication can begin not from any part of the DNA, but from a strictly defined site called the replication initiation site. In the genome of such sites there can be only one or so. lot. The concept of replication is closely related to the concept of a replication initiation site.

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