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


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.


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.


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.


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