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However, DNA polymerase cannot synthesize DNA de novo for a given template, the job is done by the RNA polymerase which works only as long as DNA template is available. Thus, RNA polymerase works in DNA replication in eukaryotes where it is known as DNA primase. DNA primase is capable of generating 10-nucleotide-long RNA primers, which are eventually replaced by DNA. This protects the lagging strand from being a combination of DNA and RNA and hence absolute DNA strand is synthesized. DNA polymerase anchors itself to both the newly formed strands. An RNAseH enzyme is used to remove the RNA primers from the Okazaki fragments while the DNA ligase seals the adjoining Okazaki fragments to form a continuous DNA strand. DNA topoisomerase are group of enzymes that play role in winding and unwinding of the DNA helix.