6.2 DNA Replication

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DNA Replication

DNA replicates during the S phase of the cell cycle

the alternative models of DNA replication are conservative, semi conservative, and dispersive

the correct one for DNA is semi conservative

<p>DNA replicates during the S phase of the cell cycle</p><p>the alternative models of DNA replication are conservative, semi conservative, and dispersive</p><p>the correct one for DNA is semi conservative</p>
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Conservative model

the parental strands direct synthesis of an entirely new double stranded molecule

the parental strands are fully “conserved”

<p>the parental strands direct synthesis of an entirely new double stranded molecule</p><p>the parental strands are fully “conserved”</p>
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Semi conservative model

the two parental strands each make a copy of itself

after one round of replication, the 2 daughter molecules each have 1 parental and 1 new strand

<p>the two parental strands each make a copy of itself</p><p>after one round of replication, the 2 daughter molecules each have 1 parental and 1 new strand</p>
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Dispersive model

the material in the two parental strands is dispersed randomly between the 2 daughter molecules

after one round of replication, the daughter molecules contain a random mix of parental and new DNA

<p>the material in the two parental strands is dispersed randomly between the 2 daughter molecules</p><p>after one round of replication, the daughter molecules contain a random mix of parental and new DNA</p>
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Origins of replication

DNA replication begins at sites called origins of replication

prokaryotes have one origin of replication, eukaryotes have many

various proteins attach to the origin of replication and open the DNA to form a replication fork

<p>DNA replication begins at sites called origins of replication</p><p>prokaryotes have one origin of replication, eukaryotes have many</p><p>various proteins attach to the origin of replication and open the DNA to form a replication fork</p>
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