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Semi-conservative DNA replication
Age 16 · Biology
DNA replication begins when the double helix unwinds and separates. Each old strand directs the formation of a new strand, so every resulting double helix has one old strand and one new strand.
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Age 16: open this week
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In the picture
- Closed double helix: two blue strands wound together.
- Fork bead: enzyme at the point where the helix separates.
- One separated double helix: a blue strand paired with an orange strand.
- The other separated double helix: a blue strand paired with an orange strand.
Examples
- A photocopy that keeps one original page and adds one fresh page.
- A zipper opening: each side guides a matching new side.
Key takeaways
- Each new DNA molecule keeps one strand from the original molecule.
- The base-pairing rules let each old strand build a matching new strand.
Quiz: Semi-conservative DNA replication (Age 16)
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After DNA replication, what is true about each new DNA molecule?
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How does an old DNA strand help build a new strand?
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What happens to the double helix at the start of DNA replication?
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