DNA replication.

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Presentation transcript:

DNA replication

Occurs during S phase of Interphase during the cell cycle. Makes an exact copy of all DNA. Is “semi-conservative” – 1 strand is “old” & the other strand is “new”.

Replication requires enzymes: 1) Helicase – unwinds DNA 2) DNA polymerase – puts new nucleotides in place & proofreads

The process of DNA replication DNA unwinds & unzips – uses Helicase Replication fork forms (area where 2 strands separate) * there are several replication forks at the same time. 3) DNA polymerase adds new nucleotides to each DNA strand, following the base pair rule!

DNA Replication

RNA Transcription