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DNA Replication
Discovering the structure of DNA   ,[object Object],[object Object],[object Object]
Discovering the structure of DNA   ,[object Object],[object Object]
Others contributed to the discovery of DNA Rosalind Franklin: DNA image through X-ray technology Erwin Chargaff found that number of bases were approximately equal to their bonding partner A = T  &  C = G
Cell division – why DNA replicates! ,[object Object], Growth, Repair, Replacement ,[object Object],[object Object],[object Object]
DNA replication
DNA REPLICATION ,[object Object],SEMI-CONSERVATIVE - half of the old strand is saved
DNA replication
Replication: 1st step ,[object Object],[object Object],[object Object],[object Object],single-stranded binding proteins replication fork helicase
DNA replication
DNA replication
Replication: 2nd step DNA Polymerase III But … We ’ re missing  something ! What? Where ’ s the ENERGY for the bonding ! ,[object Object],[object Object],[object Object]
Energy of Replication ,[object Object],energy ATP GTP TTP CTP ADP AMP GMP TMP CMP modified nucleotide energy We come with our  own energy !   And we leave behind a nucleotide !   You remember ATP ! Are there  other ways to get energy out of it? Are there other energy nucleotides? You bet !
DNA replication
DNA replication Original DNA strands
DNA replication Newly assembled DNA strands
DNA replication Semi-conservative replication
Figure 11.8 Schematic representation of DNA Polymerase III Structure resembles a human right hand Template DNA thread through the palm;  Thumb and fingers wrapped around the DNA
DNA polymerases ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],DNA polymerase III  enzyme Arthur Kornberg 1959 Roger Kornberg 2006
Editing & proofreading DNA ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Replication fork 3’ 5’ 3’ 5’ 5’ 3’ 3’ 5’ helicase SSB = single-stranded binding proteins primase DNA  polymerase III DNA  polymerase III DNA  polymerase I ligase Okazaki  fragments leading strand lagging strand SSB direction of replication
 
The next part of the process ,[object Object],[object Object],[object Object],[object Object]
DNA -->  RNA -->  Protein Proteins are the building blocks of the organism (traits)
Transcription  -  process where RNA is made from DNA Translation  - process where proteins are made from RNA
 

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Dna replication

Editor's Notes

  1. In 1953, Kornberg was appointed head of the Department of Microbiology in the Washington University School of Medicine in St. Louis. It was here that he isolated DNA polymerase I and showed that life (DNA) can be made in a test tube. In 1959, Kornberg shared the Nobel Prize for Physiology or Medicine with Severo Ochoa — Kornberg for the enzymatic synthesis of DNA, Ochoa for the enzymatic synthesis of RNA.