DNA Replication DNA mRNA protein transcription translation replication Before each cell division the DNA must be replicated so each daughter cell can get.

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Presentation transcript:

DNA Replication DNA mRNA protein transcription translation replication Before each cell division the DNA must be replicated so each daughter cell can get a complete genetic set

3' end 5' end Old strands New strands Complementary Base Pairing is at the Heart of DNA Replication

DNA polymerase adds deoxyNTPs to 3’ end of DNA 5’ to 3’ synthesis requires a DNA template requires a primer (either DNA or RNA) for starting DNA replication DNA Replication

Primer

phosphodiester bond formation

Many Primers are Required In Lagging Strand Synthesis

DNA Replication in a test tube is used for DNA sequencing and PCR

Primers – short pieces of single stranded DNA can be synthesized chemically

Polymerase chain reaction, PCR makes many copies of a DNA sequence by repeated rounds of DNA replication First the DNA is denatured (95 degrees C) Then short single stranded DNAs (PRIMERS) are allowed to bind - ANNEALING STEP

The temperature of the annealing step is adjusted to allow the primers to just be able to bind (60 degrees C) Each DNA Polymerase extends from the primers Each PCR cycle doubles the number of target molecules