DNA REPLICATION Flashcards
what is dna
biological proccess of prducing two identicla replicas of dna from one original dna molecule
dna important for
-protein synthetis
-neccessary for cell dividion ,S phase of the cycle
building blocks
free nucleotides
result
two dna molecules consisting of one old and one brand new chain of nucleotides-semi-conservative
helicase
destabilizing enzyme,seperates the two strands of dna
primase
provides a starting point for RNA(or DNA) fro DNA polymerase to begin synthetis of the new DNA strand
DNA polymerase
the enzyme responsible for catalyzing(make it happen) the addition of nucleotide substrades to DNA in the 5’to 3’direction-also proof reading and error connection
exonuclease
-removes RNA nucleoids
DNA ligase
seals up the frgaments again forming a double helix
stages of dna replication
initiation
elongation
termination
initiation
unwinding of the double helix,formation of replication fork
elongation
adding of free nucleoids to replication fork
termination
stopping replication