KEY CONCEPT DNA replication makes an exact copy of DNA.

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Presentation transcript:

KEY CONCEPT DNA replication makes an exact copy of DNA.

DNA Replication: Why? So each cell at the end of mitosis will have the exact same DNA When? In interphase (S period) Where? In the nucleus

How Replication occurs: An enzyme “unzips” the DNA by breaking weak hydrogen bonds between Nitrogen bases nucleotide The DNA molecule unzips in both directions.

2. Free-floating nucleotides bond to each side of the DNA strands. 3. Enzymes form covalent bonds in the new strands. DNA polymerase new strand nucleotide

Other enzymes “proofread” the new DNA and make necessary repairs (errors are limited to approximately one error per 1 billion nucleotides)

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