So codons code for amino acids. But during new DNA replication, there are already proteins (enzymes) made of amino acids that sequentially come together to make new DNA. Where do all those enzymes come from (helicase, polymerases, ligases, topoisomerase) in the first place? In order for DNA to occur those enzymes need to be in place first right? Also where does DNA polymerase get its nucleotides to be inserted into the 3' strand? I am a 3' lagging strand.
Thanks.