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before cells divide, what must the DNA do?
all DNA must replicate to provide a copy for the new cell
what’s the process of DNA replication?
semi conservative
what does semi conservative mean?
in the daughter DNA one strand is from the parental DNA and one strand is newly synthesised
what happens during stage one of DNA replication?
DNA helicase breaks the hydrogen bonds between the complimentary base pairs between the two strands within a double helix
this causes the DNA double helix to unwind
what happens during stage two of DNA replication?
each of the separated DNA strands acts as a template
free floating DNA nucleotides within the nucleus are attached to their complementary base pairs on either template strands of the parental DNA
what happens during stage three of DNA replication?
the adjacent nucleotides are joined together (to form the phosphodiester bond) by a condensation reaction
DNA polymerase catalyses the joining together of adjacent nucleotides
what happens during stage four of DNA replication?
the two sets of daughter DNA contains one strand of the parental DNA and one newly synthesised strand