Question

why is a primer dna needed in dna synthesis

Answer 1

A primer DNA is needed in DNA synthesis because it serves as a starting point for DNA polymerase, the enzyme that actually adds new nucleotides to the growing DNA strand. DNA polymerase can only add nucleotides to an existing strand of DNA, so the primer provides a template for the polymerase to start adding new nucleotides. Without a primer, DNA synthesis cannot occur.