Order the following steps of DNA sequencing, beginning with the first step at the top. 1 The original sequence can be deduced by "reading" the fragments. 2 DNA polymerase makes complementary copies of the unknown sequence by adding nucleotides to the end of a primer. 3 Electrophoresis separates the fragments by size. 4 DNA replication stops each time a terminator nucleotide is added, creating DNA fragments of different sizes. 5 Place primers, replication enzymes, unknown sequence, normal nucleotides, and terminator nucleotides into reaction mixture. 6 Samples containing fragments of complementary copies of the unknown sequences are transferred to an electrophoresis gel. Correct Answer 1 Place primers, replication enzymes, unknown sequence, normal nucleotides, and terminator nucleotides into reaction mixture. 2 DNA polymerase makes complementary copies of the Junknown sequence by adding nucleotides to the end of a primer. 3 DNA replication stops each time a terminator nucleotide is added, creating DNA fragments of different sizes. 4 Samples containing fragments of complementary copies of the unknown sequences are transferred to an electrophoresis gel. 5 Electrophoresis separates the fragments by size. 6 The original sequence can be deduced by "reading" the fragments.