DNA Replication
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DNA replication copies the genetic information of a cell by using one strand of DNA as a template to produce an identical new strand. The DNA double helix unwinds and enzymes add complementary nucleotides to each exposed strand to produce two new DNA molecules each with one original and one new strand of DNA. DNA replication is highly regulated and occurs with precision during the S phase of the cell cycle to produce two identical DNA molecules.
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DNA Replication
- 1. 8.3 DNA Replication KEY CONCEPT DNA replication copies the genetic information of a cell.
- 2. 8.3 DNA Replication 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.
- 3. 8.3 DNA Replication 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. nucleotide The DNA molecule unzips in both directions.
- 4. 8.3 DNA Replication – DNA polymerase enzymes bond the nucleotides together to form the double helix. – Polymerase enzymes form covalent bonds between nucleotides in the new strand. new strand nucleotide DNA polymerase
- 5. 8.3 DNA Replication • Two new molecules of DNA are formed, each with an original strand and a newly formed strand. • DNA replication is semiconservative. original strand Two molecules of DNA new strand
- 6. 8.3 DNA Replication Replication is fast and accurate. • DNA replication starts at many points in eukaryotic chromosomes. There are many origins of replication in eukaryotic chromosomes. • DNA polymerases can find and correct errors.