During DNA replication elongation, DNA polymerase adds nucleotides to the leading strand continuously while the lagging strand is synthesized in fragments with replacement of RNA primers by DNA nucleotides.
During the elongation stage of DNA replication, DNA polymerase adds nucleotides to the leading strand continuously in the 5' → 3' direction. Meanwhile, on the lagging strand, DNA is synthesized in short Okazaki fragments, each requiring its own primer. The RNA primers are replaced with DNA nucleotides, and DNA ligase seals the gaps between these fragments.
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