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Dna

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    Dna Dna Presentation Transcript

    • DNA
      • Objectives:
      • What scientists contributed to the discovery of DNA?
      • What is the structure and function of DNA and RNA?
      • How does DNA replicate?
      • What is transcription and translation?
      jj
    • History
      • Rosalind Franklin, and her colleague Maurice Wilkins, in 1950 X-Rayed DNA to determine the basic structure.
      • In 1953 Scientists Watson and Crick used evidence from other scientists to determine the structure of DNA.
      X-ray photograph taken by Roseland Franklin
    • Structure of DNA
      • Monomers = nucleotides
      • Each nucleotide contains 3 basic parts:
      Millions of these bases combine to form DNA!
        • a 5-carbon sugar (deoxyribose)
        • a phosphate group
        • and one of four nitrogen bases
      base sugar P
    • DNA structure – nitrogen bases
      • The 4 different bases are
      • Adenine, Thymine, Cytosine, and Guanine.
      • They pair to form the ladder-like structure that is DNA
      A sugar P T sugar P
        • A pairs with T
      C sugar P G sugar P
        • C pairs with G
    • What Does DNA Stand For? D = Deoxyribose sugar NA = Nucleic Acid Deoxyribonucleic acid
    • DNA structure – nitrogen bases Millions Base pairs long! Twists to double helix shape
    • The double helix looks like a double twisted ladder This is further twisted and packed into chromosomes in the nucleus.
    • Draw your own DNA strand
      • Use the format on the left
      • Strand should be 8 base pairs long
      • Include a key telling what A, G, C, T, S, and P stand for
      • A, G, C, and T can be in any order, but must be paired correctly!
      A s P T s P C s P G s P
    • DNA Replication                                                                                             DNA before replication The 2 strands unzip, exposing the nucleotides The free “floating” nucleotides pair with the exposed nucleotides, forming 2 identical chains.
    • Replicate your own DNA strand
      • Use scissors to cut your DNA in half (normally enzymes do this job)
      • Tape or glue your 2 new strands.
      • Draw in the missing Nucleic Acids to complete your two strands.
      A s P C s P T s P G s P
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