What stage of the cell cycle does semi-conservative replication occur?
Interphase- when the cell prepares to divide.
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What is semi-conservative replication?
Where each new DNA molecule is made from one original strand and one new strand.
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Describe the process of semi-conservative replication.
DNA helix unwinds. H-bonds between bases break-DNA helicase. Free DNA nucleotides in nucleus join with exposed bases on strands. New H-bonds form in complementary base pairing. New sugar-phosphate backbone joins by covalent bonds-DNA polymerase.
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Are the new DNA molecules different to the orginal?
No, they are identical. The original strands are used as templates to make the new strands.
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What does DNA helicase do?
Unwinds and unzips DNA by breaking the hydrogen bonds between bases.
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What does DNA polymerase do?
Links the newly arrived nucleotides by forming covalent bonds between phosphates and sugars. It only does this if the nucleotides are correctly paired.
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Other cards in this set
Card 2
Front
What stage of the cell cycle does semi-conservative replication occur?
Back
Interphase- when the cell prepares to divide.
Card 3
Front
What is semi-conservative replication?
Back
Card 4
Front
Describe the process of semi-conservative replication.
Back
Card 5
Front
Are the new DNA molecules different to the orginal?
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