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The resulting stretch of newly synthesized DNA that is associated with this lagging or discontinuous strand is called an Okazaki fragment. Okazaki fragments, as with DNA replication in general, requires RNA priming, which serves as the beginning of an Okazaki fragment.
Leading & Lagging strand synthesis uses a single, dimeric DNAPol III enzyme. Models of DNA synthesis often show it as occurring independently on the leading and lagging strands, with separate DNAPol III s on each. However, replication at any one fork is under the control of a single, dimeric DNAPol III holoenzyme [the two donut-shaped rings] that replicates both parental DNA strands simultaneously.