Chapter 25
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Chapter 25. DNA replication. DNA Review. DNA is a nucleic acid The components are Deoxyribose Phosphate Nitrogen Base The nitrogen bases are Guanine, Cytosine, Adenine, and Thymine The structure is... Double helix. DNA Replication. DNA needs to be replicated so cells may divide

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Chapter 25

Chapter 25

DNA replication


Dna review
DNA Review

  • DNA is a nucleic acid

  • The components are

    • Deoxyribose

    • Phosphate

    • Nitrogen Base

  • The nitrogen bases are

    • Guanine, Cytosine, Adenine, and Thymine

  • The structure is...

    • Double helix


Dna replication
DNA Replication

  • DNA needs to be replicated so cells may divide

  • 3 steps in replication

    • Unwinding  The two strands that were held together by hydrogen bonds separate and the hydrogen bonds break. The Enzyme DNA Helicase “unzips” the DNA

    • Complementary Base Pairing  nucleotides fit into place

    • Joining  the complementary nucleotides join together to make new strands. They are joined with the enzyme DNA Polymerase


Chapter 25

This is the Unwinding stage. DNA Helicase

This is where the Nitrogen Base Pairs pair up with the old DNA

DNA Polymerase combines the nucleotides and changes it into a new strand


Chapter 25

  • This DNA replication is called Semiconservative because each new double helix has one old strand and one new strand

  • DNA replication occurs in the nucleus and it needs to happen before cell division

  • The old strand is called the parent strand

  • The new strand is called the daughter strand