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DNA Replication Notes

DNA Replication Notes. Chapter 12-2 Pgs 295-299. Student Expectation (SE) 5A – describe the stages of the cell cycle , including deoxyribonucleic acid (DNA) replication and mitosis , and the importance of the cell cycle to the growth of organisms.

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DNA Replication Notes

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  1. DNA Replication Notes Chapter12-2 Pgs 295-299 Student Expectation (SE) 5A – describethe stages of the cell cycle, including deoxyribonucleic acid (DNA) replication and mitosis, and the importance of the cell cycleto the growth of organisms Student Expectation (SE) 5A – describethe stages of the cell cycle, including deoxyribonucleic acid (DNA) replication and mitosis, and the importance of the cell cycleto the growth of organisms .

  2. 1. DNA Structure Review • DNA = Deoxyribonucleic acid • Shaped like a double helix • Nucleotide Monomers are made of a phosphate, a sugar and a base. • The order of the bases determine what you look like.

  3. 2. How does your body make new DNA? • Every time your body makes new cells, it must first make new DNA. • The parent cell replicates its DNA and then splits into two. • Each daughter cell has identical DNA to the parent cell.

  4. 3. DNA Replication Step 1 - First the enzyme helicase unzips the two DNA strands by breaking the weak hydrogen bonds between the bases.

  5. 3. DNA Replication 1 - First the enzyme helicase unzips the two DNA strands by breaking the weak hydrogen bonds between the bases.

  6. 3. DNA Replication Replication Fork Step 1 - First the enzyme helicase unzips the two DNA strands by breaking the weak hydrogen bonds between the bases.

  7. 3. DNA Replication Step 2 – Another enzyme called DNA Polymerase attaches New DNA nucleotides to the parent DNA templates.

  8. 3. DNA Replication Original DNA strands Step 3 – The new bases are joined by the third enzyme Ligase and two identical DNA molecules now exist.

  9. 3. DNA Replication Newly assembled DNA strands Step 3 – The new bases are joined by the third Enzyme Ligase and two identical DNA molecules now exist.

  10. DNA Template Parental DNA New DNA 4. Why is DNA called semi-conservative? • DNA Replication is called semi-conservative because each new DNA molecule has one parent template strand and one new DNA strand.

  11. DNA replication DNA replication http://www.youtube.com/watch?v=zdDkiRw1PdU

  12. DNA replication Let’s build our own DNA model and simulate DNA replication

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