semi-conservative as half of the strands in each newDNAmolecule are from the original DNA molecule
means there's genetic continuity between each generation of cells
enzyme DNAhelicase breaks the hydrogenbonds between the complementary bases on the two strands. makes the helix unwind forming two singlestrands
2. each original strand acts as a template for the new strand. complementary base pairing means free floating nucleotides are attracted to their complementaryexposedbase on template strand
3. condensation reaction joins the nucleotides of the new strand together - catalysed by DNApolymerase.hydrogen bonds form between the bases on the new strand and original strand
4. each new DNA molecule contains one strand from the original molecule and one new strand
