what does rna primase add to each strand of dna
In simple terms: Function of the RNA primer: DNA polymerases need a double-stranded DNA region to which they can attach in order to begin copying the rest of the DNA strand. In order to provide this double-stranded attachment site, RNA primers are added by primase, an RNA polymerase which does not require such an attachment site itself. When DNA replication starts, one primer is needed at the start of the leading strand.