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DNA Replication

DNA Replication. AP Biology Ch 16.2. Remember…. You started as one cell with one set of DNA Now you are trillions of cells! Each cell has the same DNA. How does each cell get DNA?. DNA Replication Process by which DNA is copied Occurs in all living organisms Many enzymes are used!.

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DNA Replication

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  1. DNA Replication AP Biology Ch 16.2

  2. Remember… • You started as one cell with one set of DNA • Now you are trillions of cells! • Each cell has the same DNA

  3. How does each cell get DNA? • DNA Replication • Process by which DNA is copied • Occurs in all living organisms • Many enzymes are used!

  4. DNA structure

  5. DNA structure

  6. Step 1: DNA Replication • Start with one complete strand of DNA • Template Strand • Parent Strand

  7. Step 2: DNA Replication • Topoisomerase • unwinds DNA

  8. Step 3: DNA Replication • Helicase • Unzips template strand at H bonds

  9. Step 4: DNA Replication • Replication fork forms

  10. Step 5: DNA Replication • DNA polymerase • Finds starter sequence • Adds free DNA nucleotides • Checks the sequence • Makes repairs

  11. Step 6: Okazaki Fragments • DNA is antiparallel • One strand of DNA: • synthesized continuously • The other strand of DNA: • is synthesized in segments (O.F.)

  12. Step 7: DNA Replication • DNA Ligase • Connects Okazaki fragments

  13. Step 8: DNA Replication • Two identical strands of DNA are formed • Each strand has a parent and daughter strand

  14. The Others

  15. Replication Animations • PBS: • http://www.youtube.com/watch?v=5VefaI0LrgE • St. Olaf: • http://www.stolaf.edu/people/giannini/flashanimat/molgenetics/dna-rna2.swf

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