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DNA Replication IAN pg. 97

DNA Replication IAN pg. 97. MAIN IDEAS DNA Helicase DNA Polymerease Base Pairing Chromatids Centromere. Objective: Identify and Define the parts of DNA using notes, lecture, collaboration and origami . A. DNA Helicase enzyme untwists and unzips DNA exposing base pairs.

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DNA Replication IAN pg. 97

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  1. DNA Replication IAN pg. 97 MAIN IDEAS • DNA Helicase • DNA Polymerease • Base Pairing • Chromatids • Centromere Objective:Identify and Define the parts of DNA using notes, lecture, collaboration and origami.

  2. A. DNA Helicase enzyme untwists and unzips DNA exposingbase pairs I. DNA Replication before Cell Division (S-Phase)

  3. B. DNA polymerase enzyme attaches new nucleotide bases to create 2 identical copies of DNA. 1. Nucleotides pairing A – TC - G

  4. BASE PAIRING RULE TOP ½ IAN Page 96

  5. DNA Polymerase C. Following replication 2 genetically identical copies condense into chromosomes

  6. D. Chromosomes have 2 parts 1. Chromatidsarms of the chromosome, genetically identical from DNA replication 2. Centromerecenterprotein structure holds chromatids together.

  7. Chromosome Bottom ½ IAN page 96 Centromere Chromatid Chromatid Genetically Identical arms Chromatid Chromatid

  8. II. DNA remains constant in all cells except in erythrocytes (Red Blood Cells) and sex cells III. Different Organisms have different amounts of DNA A. Homo sapiens (Humans) = 46 Chromosomes B. Myrmecia pilosula (Ant) = 2 Chromosomes C. Ophioglossom reticulatum (Fern) = 630 Chromosomes

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