Monday 18 December 2017

DNA Replication


 DNA Replication

DNA Replication results in two identical double helices where genetic information is conserved in each helix and is semi conservative as one strand is new and one strand is from the original strand.

The genetic code uses a triplet code which is called a codon and codes for the production of one amino acid.  The code is degenerate so means one amino acids can have many different types of cordons for the same amino acid.

1-DNA unzips by helicase enzyme to create replication fork and both DNA strands act as a template.

2-Primase enzyme makes a small piece of RNA called primer.

3-DNA polymerase binds to primer and adds bases to 5'-3' end and the leading strand is made continuously 5'-3' end.

Free monomer nucleotides are activated by phosphate groups are added to them and free nucleotides form hydrogen bonds with base pairs (A=T) purines and (C=G) Pyrimidines.
as lagging strand is 3'-5' end primase makes primers every 120 bases to create Okazaki fragments.

4-Exonuclease remove DNA primers.

5-DNA polymerase fills any gaps left over.

6-DNA ligase seals to create a continuous strand.






**REMEMBER TO STAY POSITIVE LIKE A PROTON!!**

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