What does enzymes do to DNA molecule?
his answer is very hard
the chains are first separated by enzymes called helicases.the helicase enzymes move along the DNA molecule and break the hydrogen bonds between the complementary bases separating the chains. then another enzyme called DNA polymerases comes and separates them even more creating new DNA molecules with new DNA and old DNA.
Electrophoresis technique is not designed to cut DNA molecule. When DNA is analyzed by electrophoresis to determine its molecular mass, the molecular biology engineer usualy digests the DNA molecule, before the electrophoresis, with specific enzymes called "restriction enzymes" in order to obtain fragments of diverse molecular weights that can be seen as bands in electrophoresis gels.