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.

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Presentation transcript:

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. 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. 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. DNA polymerase new strand nucleotide

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

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.