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Published byDeborah Greene Modified over 9 years ago
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KEY CONCEPT DNA replication copies the genetic information of a cell.
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Replication copies the genetic information.
A single strand of DNA serves as a template for a new strand. rules of base pairing direct replication. DNA is replicated during S (synthesis) stage (part of interphase). Each body cell gets a complete set of identical DNA.
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Proteins (enzymes) carry out the process of replication.
DNA serves as a template. Enzymes/other proteins drive replication. Enzymes unzip the double helix. Free-floating nucleotides form hydrogen bonds between base pairs (A-T, C-G) nucleotide The DNA molecule unzips in both directions.
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DNA polymerase enzymes bind nucleotides together.
Polymerase enzymes form covalent bonds between nucleotides in the new strand (rungs).(p233) DNA polymerase new strand nucleotide
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Two new molecules of DNA are formed, each with an original and newly formed strand- “(semiconservative)” p237 original strand new strand Two molecules of DNA
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Replication is fast and accurate.
DNA replication starts at many points in eukaryotic chromosomes. (Also has a “proof-reading” system to eliminate errors) There are many origins of replication in eukaryotic chromosomes. DNA polymerases can find and correct errors.
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