DNA history. DNA History I-Introduction II-The discovery:DNA III-Time line of scientists...
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Transcript of DNA history. DNA History I-Introduction II-The discovery:DNA III-Time line of scientists...
DNA history
DNA History
I-IntroductionII-The discovery:DNA
III-Time line of scientistsIV-Bibliography
IntroductionWhat is DNA?
Deoxyribonucleic acid What does DNA do?
the genetic instructions used in the development and functioning of all known
living organisms.Of what is dna established?
Double helix linked with hydrogen bonds; four bases: adenine, guanine, thymine and cytosine; These four bases are attached to the sugar/phosphate to form the complete nucleotide, as shown for adenosine
monophosphate.
The discovery:DNA
.He collected a lot of pus of bandages at the local hospital
.He used a salt solution to wash the pus. Then he added a weak alkaline solution to the cells lysed and nuclei precipitated out of the
solution
.So he isolated a substance called nuclein, today called DNA
.The Swiss biochemist Friedrich Miescher (1844-1895) discovered the nucleic acids in 1868. His experiment:
Time line
1840 1900 1925 1930 1935 1940 1945
1843:Gregor
Mendel
1928: Frederick Griffith
1940's:*Oswald Avery*Erwin Chargaff
Time line
1950 1960 1970 1980 1990 2000
1951:Rosalind Franklin & MauriceWilkins
1953:James Watson & Francis Crick
Pink=> guanineYellow=>cytosineRed=> thymineBlue=> adenine
Bibliography
*http://en.wikipedia.org/wiki/ *http://images.google.com/ *http://library.thinkquest.org/
The end