In the above video it shows that during DNA replication, the lagging strand require RNA primase to add 3' -OH group for further addition of nucleotides. However, it hasn't been shown that the above strand ( leading strand) require it.
Besides, RNA is needed to initiate the polymerization because it has the 3'-OH. But when I look at the structure of deoxynucleotide, it also has the 3'-OH but it does not have the 2'-OH. So why DNA cannot initiate the polymerization?
Thanks for your answer!