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KEY CONCEPT DNA replication copies the genetic information of a cell.

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KEY CONCEPT DNA replication copies the genetic information of a cell. - PowerPoint PPT Presentation


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KEY CONCEPT DNA replication copies the genetic information of a cell. 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.

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Presentation Transcript
replication copies the genetic information
Replication copies the genetic information.
  • A single strand of DNA serves as a template for a new strand.
  • The rules of base pairing directreplication.
  • DNA is replicated during theS (synthesis) stage of thecell cycle.
  • Each body cell gets acomplete set ofidentical DNA.
proteins carry out the process of 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.

The DNA molecule unzips in both directions.

  • 2. Free-floating nucleotides form hydrogen bonds with the template strand.
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nucleotide

new strand

DNA polymerase

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

original strand

Two molecules of DNA

  • Finally:
  • Two new molecules of DNA are formed, each with an original strand and a newly formed strand (semiconservative).
replication is fast and accurate

There are many origins of replication in eukaryotic chromosomes.

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