Since the parental double helix must rotate 360° to unwind each gyre of the helix,during the semi-conservative replication of the bacterial chromosome,some kind of "swivel" must exist.What do geneticists now know that the required swivel is?
A) Topoisomerase B) Helicase C) A transient single-strand break produced by the action of topoisomerases D) A transient single-strand break produced by the action of helicases E) A transient single-strand break produced by the action of Ligase