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Understanding DNA Replication: The Key Process for Cell Growth and Reproduction

DNA replication is a crucial process that allows DNA to make copies of itself, necessary for cell replacement, growth, and reproduction of sperm or egg cells. The process begins with the unwinding of the DNA helix by helicase, followed by the synthesis of a short RNA primer by primase, which serves as a foundation for new DNA strands. DNA polymerase then attaches new nucleotides to form two identical DNA helices. This semi-conservative method ensures each new DNA molecule contains one old and one new strand, maintaining genetic integrity.

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Understanding DNA Replication: The Key Process for Cell Growth and Reproduction

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  1. DNA Replication

  2. DNA Replication • DNA Replication- process that DNA uses to make more DNA.

  3. When do we need to make more DNA?

  4. When do we need to make more DNA? • When we make new cells to replace dead ones. • When we make new cells to grow. • When we make sperm or egg.

  5. Steps in DNA Replication • DNA unwinds and breaks apart in between the bases. (Enzyme used– Helicase)

  6. Steps in DNA Replication • DNA unwinds and breaks apart in between the bases. • A small chain (primer) is made to that begins the new DNA strand (Enzyme used– Primase)

  7. Steps in DNA Replication • DNA unwinds and breaks apart in between the bases. • A small chain is made to that begins the new DNA strand. • New nucleotides attach to their correct partner. (Enzyme used- DNA Polymerase)

  8. Steps in DNA Replication • DNA unwinds and breaks apart in between the bases. • A small chain is made to that begins the new DNA strand. • New nucleotides attach to their correct partner. • There are now two DNA helixes.

  9. http://www.hhmi.org/biointeractive/media/DNAi_replication_vo1-lg.movhttp://www.hhmi.org/biointeractive/media/DNAi_replication_vo1-lg.mov

  10. Semi-Conservative Half- stays the same • DNA replication is semi-conservative because __________________________________________________________________

  11. Semi-Conservative Half- stays the same • DNA replication is semi-conservative because each copy of DNA has half new DNA and half old DNA.

  12. How does the structure of DNA help it to make more copies of itself?

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