one original strand of DNA remains, other polynucleotide DNA strand newly created by cell
importance of keeping OG strand
ensure genetic continuity between generations of cells
ensures new cells produced inherit all genes from parent cel
DNA replication
occurs in preperation for mitosis(S phase)
DNA helicase breaks hydrogen bonds between bases and DNA unwinds
each strand is used as a template strange
free DNA nucleotides attach to bases via complementary base pairing- adjacent nucleotides form phosphodiester bonds via condensation reactions, catalysed by DNA polymerase
bases join via hydrogen bonds to form new DNA molecule
