When replication starts, an origin of replication forms, consisting of two ____________ moving in opposite directions. dna double helix is separated into single strands by the enzyme ____________ . newly-exposed, unreplicated dna is protected by ____________ . short segments of rna are synthesized, called ____________ . the enzyme that synthesizes the short segments of rna is called a ____________ . the short rna segments provide a free ____________ for replication. new dna is synthesized in the ____________ direction. the enzyme that removes tightened coils ahead of the replication fork is ____________ . the enzyme that catalyzes new dna synthesis is ____________ . dna synthesis occurs continuously on the ____________ . dna synthesis occurs in small sections on the ____________ . fragments of discontinuous dna synthesis are called ____________ . gaps in the sugar-phosphate backbone of dna are closed by ____________ ?