Section 8-3 “DNA Replication” Write everything that will go on Power notes
KEY CONCEPT DNA replication copies the genetic information of a cell
Replication = Copy Vocab alert: http://www.youtube.com/watch?v=teV62zrm2P0&feature=related
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
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
The DNA molecule unzips in both directions nucleotide The DNA molecule unzips in both directions
DNA polymerase enzymes bond the nucleotides together to form the double helix Polymerase enzymes form covalent bonds between nucleotides in the new strand
nucleotide new strand DNA polymerase
Two new molecules of DNA are formed, each with an original strand and a newly formed strand new strand Two molecules of DNA
Replication is fast and accurate DNA replication starts at many points in eukaryotic chromosomes DNA polymerases can find and correct errors (mistakes)
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
Process by which DNA is copied during the cell cycle Sugar –phosphate backbone
2. Nitrogen-containing bases and free floating nucleotide
3. DNA PolymeraseIII
4. newly formed strand of DNA
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.
2.Nucleotides pair with the bases on the template strands as they are exposed
3.DNA Polymerase III bonds the new nucleotides together
4. Two identical molecules of DNA result. Each new molecule has one strand from the original molecule and one new strand.