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6.1 DNA and the Code of Life

6.1 DNA and the Code of Life. Pages 228-233. nuclein. A name given to DNA when it was discovered by Friedrich Miescher in 1869. Joachim Hammerling. performed experiments on Acetabularia to verify that the genetic material was in the nucleus .

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6.1 DNA and the Code of Life

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  1. 6.1 DNA and the Code of Life Pages 228-233

  2. nuclein • A name given to DNA when it was discovered by Friedrich Miescher in 1869.

  3. Joachim Hammerling performed experiments on Acetabularia to verify that the genetic material was in the nucleus. image: taringa.net image: biologysemester58.wikispaces.com

  4. Alfred Hershey and Martha Chase 1952- showed that viruses needed only to inject their DNA into a bacteria to produce more viruses. Image: osulibrary.orst.edu

  5. Phoebus Levene 1920’s DNA was composed of: • A pentose sugar (cyclic, 5-carbon sugar) • A nitogenous base • A phospate group, PO43-

  6. 5 Carbon sugar • Deoxyribose has one less oxygen atom than ribose. Image: mun.ca

  7. Phosphate group PO43- image: m2c3.com

  8. Nitrogenous Bases • Adenine, guanine, cytosine, thymine Image: faculty.ccbcmd.edu

  9. Erwin Chargaff 1940 The amount of Adenine, A, is equal to the amount of Thymine, T. The amount of Guanine, G, is equal to the amount of Cytosine, C.

  10. Nucleotide • DNA has a negative charge because of the phosphate ions in its backbone. image: dnareplication.info

  11. Rosalin Franklin 1951 X-ray crystallography: x-rays were aimed at a crystal of DNA to produce a diffraction pattern. Image: cwp.library.ucla.edu image: shellemsbioblog.blogspot.com

  12. James Watson and Francis Crick • 1953 DNA model Image: chemheritage.org

  13. Complimentary base pairing Image: dedunn.edublogs.org

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