DNA history. DNA History I-Introduction II-The discovery:DNA III-Time line of scientists IV-Bibliography.

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