Primosome

RNA primers are synthesized by PRIMOSOME, specifically, dnaG or primase enzyme... the RNA primer came from dnaG plus dna B interactions....so I guess your question should be put in another way... the RNA primer is the product, yet the PRIMOSOME ...

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... strand. Therefore, to start the synthesis of the leading strand and each DNA fragment of the lagging strand, an RNA polymerase complex called a primosome or primase is required. The primase, which is capable of joining RNA nucleotides without requiring a preexisting strand of nucleic acid, first ...

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