1. Section 8-3 “DNA Replication”
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2. KEY CONCEPT DNA replication copies the genetic information of a cell

3. Replication = Copy Vocab alert:

4. Replication copies the genetic information.
A single strand of DNA serves as a template for a new strand
The rules of base pairing direct replication
DNA is replicated during the S (synthesis) stage of the cell cycle
Each body cell gets a complete set of identical DNA

5. Proteins carry out the process of replication
DNA serves only as a template
Enzymes and other proteins do the actual work of replication
Enzymes unzip the double helix
Free-floating nucleotides form hydrogen bonds with the template strand

6. The DNA molecule unzips in both directions
nucleotide
The DNA molecule unzips in both directions

7. DNA polymerase enzymes bond the nucleotides together to form the double helix
Polymerase enzymes form covalent bonds between nucleotides in the new strand

8. nucleotide
new strand
DNA polymerase

9. Two new molecules of DNA are formed, each with an original strand and a newly formed strand
new strand
Two molecules of DNA

10. Replication is fast and accurate
DNA replication starts at many points in eukaryotic chromosomes
DNA polymerases can find and correct errors (mistakes)

11. Enzymes are like the scissors DNA polymerases are like the glue
One double helix of DNA now becomes 2 double helix strands that are identical.
replication 3

12. Process by which DNA is copied during the cell cycle
Sugar –phosphate backbone

13. 2. Nitrogen-containing bases and free floating nucleotide

14. 3. DNA PolymeraseIII

15. 4. newly formed strand of DNA

16. Process by which DNA is copied during the cell cycle
1. Helicase(enzyme) begins to unzip the double helix at two places at the same time.

17. 2.Nucleotides pair with the bases on the template
strands as they are exposed

18. 3.DNA Polymerase III bonds the new nucleotides
together

19. 4. Two identical molecules of DNA result. Each new molecule has one
strand from the original molecule and one new strand.