6.1 dna and the code of life
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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 . - PowerPoint PPT PresentationTRANSCRIPT
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6.1 DNA and the Code of Life
Pages 228-233
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nuclein
• A name given to DNA when it was discovered by Friedrich Miescher in 1869.
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Joachim Hammerling
performed experiments on Acetabularia to verify that the genetic material was in the nucleus.
image: taringa.net image: biologysemester58.wikispaces.com
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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
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Phoebus Levene
1920’sDNA was composed of: A pentose sugar (cyclic, 5-carbon sugar) A nitogenous base A phospate group, PO4
3-
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5 Carbon sugar
• Deoxyribose has one less oxygen atom than ribose.
Image: mun.ca
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Phosphate group
PO43-
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Nitrogenous Bases
• Adenine, guanine, cytosine, thymine
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Erwin Chargaff
1940The 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.
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Nucleotide
• DNA has a negative charge because of the phosphate ions in its backbone.
image: dnareplication.info
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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
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James Watson and Francis Crick
• 1953 DNA model
Image: chemheritage.org
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Complimentary base pairing
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