When a cell copies a DNA molecule, which of the following steps occur in the correct order?
1)DNA is unzipped by helicase, the complementary bases are added to each template strand by DNA polymerase, the 2 new strands are proofread for errors by DNA polymerase and then DNA winds up.
2) The complementary bases are added to each template strand by DNA polymerase, DNA is unzipped by helicase, the 2 new strands are proofread for errors by DNA polymerase and then DNA winds up.
3) DNA is unzipped by helicase, the 2 new strands are proofread for errors by DNA polymerase, the complementary bases are added to each template strand by DNA polymerase and then DNA winds up.
4) The 2 new strands are proofread for errors by DNA polymerase, DNA is unzipped by helicase, the complementary bases are added to each template strand by DNA polymerase and then DNA winds up.