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DNA Replication

DNA replication is a crucial process occurring before cell division, ensuring each daughter cell receives a complete set of DNA. Learn about the steps involved, including helicase unzipping DNA, base pairs separation, template usage, and DNA polymerase activity. Explore the significance of DNA replication in mitosis and meiosis, where two identical DNA strands are produced for cell division.

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DNA Replication

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  1. DNA Replication

  2. Occurs prior to cell division. (mitosis and meiosis) • Ensures that each daughter cell will have a complete set of DNA molecules.

  3. DNA molecules separate into 2 strands. • Each strand of the DNA serves as a template for the new strand. • In most eukaryotic cells, DNA replication occurs at hundreds of different places.

  4. Steps of DNA Replication • 1. Enzyme (helicase) unzip a molecule of DNA. • 2. Hydrogen bonds between base pairs are broken, 2 strands unwind. • 3. Each strand serves as the template for the attachment complementary bases. • 4. DNA polymerase brings in DNA nucleotides complementary to the exposed bases.

  5. DNA replication – helix unzips

  6. DNA replication – each side is now a template

  7. Two new identical strands are produced:

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