Why are primers needed for DNA replication? They help direct the placement of the telomeres. They help with the joining of Okazaki fragments. The primers help with the proofreading function of DNA polymerase. DNA polymerase can only add nucleotides to an existing chain. A tiny amount of RNA is needed to tell the cell where genes are located.

Primase makes a RNA groundwork, or short stretch of nucleic corrosive reciprocal to the layout, that gives a 3' end for DNA polymerase to take a shot at. A normal groundwork is around five to ten nucleotides in length. The preliminary primes DNA amalgamation, i.e., kicks it off.
When the RNA preliminary is set up, DNA polymerase "extends" it, adding nucleotides individually to make another DNA strand that is integral to the layout strand.
DNA polymerases can just make DNA in the 5' to 3' directions, and this represents an issue during replication. A DNA double helix is constantly hostile to resemble; as it were, one strand runs in the 5' to 3' heading, while different runs in the 3' to 5' bearing. This makes it fundamental for the two new strands, which are likewise antiparallel to their layouts, to be made in somewhat various ways.