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DNA REPLICATION STRUCTURE - Coggle Diagram
DNA REPLICATION STRUCTURE
DNA Structure
Nucleotides
Nitrogenous bases: A, T, G, C
Phosphate group
double structure
Two strands
Antiparallel
Nitrogenous bases inside
Base pairing: A–T, G–C
Models of Replication
Semiconservative
Conservative
Dispersive
Enzymes
Helicase
Unwinds DNA
Topoisomerase
unwinds and relaxes DNA.
Primase
lays RNA primer
DNA Polymerase
builds DNA
Ligase
Connects Okazaki fragments
Replication
DNA polymerase adds nucleotides 5 to 3
Proofreading
DNA polymerase corrects mistakes
Mismatch repair fixes remaining mistakes
Telomeres
Protect genes from erosion
Telomerase extends telomeres in germ cells
Shortening linked to aging; telomerase active in cancer