8.3 DNA Replication KEY CONCEPT General Description: DNA replication copies the genetic information...
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Transcript of 8.3 DNA Replication KEY CONCEPT General Description: DNA replication copies the genetic information...
8.3 DNA Replication
KEY CONCEPT General Description: DNA replication copies the genetic information of a cell.
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 directreplication.
• DNA is replicated during theS (synthesis) stage of thecell cycle.
• Each body cell gets acomplete set ofidentical DNA.
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.• Process
1. Enzymes unzip the double helix. (DNA Helicase)2. Free-floating nucleotides form hydrogen bonds
with the template strand.nucleotide
The DNA molecule unzips in both directions.
8.3 DNA Replication
3. DNA polymerase enzymes bond the nucleotides together to form the double helix.
- DNA polymerases can find and correct errors.
3. DNA polymerase
4. new strand 2. Nucleotide
1. Sugar Phosphate Backbone
8.3 DNA Replication
• DNA replication is semi-conservative, meaning one original strand and one new strand.
original strand new strand
Two molecules of DNA
4. Two new molecules of DNA are formed, each with an original strand and a newly formed strand.
8.3 DNA Replication
There are many origins of replication in eukaryotic chromosomes.
• DNA replication starts at many points in eukaryotic chromosomes.
Replication is fast and accurate.
8.3 DNA Replication
How does replication conserve genetic information?
• Each parent or original strand of DNA serves as a template, allowing 2 identical strands of DNA to be made. This means the information “stays” the same or is “conserved”.
• https://www.youtube.com/watch?v=zdDkiRw1PdU
8.3 DNA Replication
• https://www.youtube.com/watch?v=z685FFqmrpo