Summary DNA Notes and Summaries

_
DNA -




History -




1950 :
·

Maurice Wilkens and Rosalind Franklin

Look at x-ray diffractions

DNA is a helix

James Watson Francis Crick
·


and


Analysed data
-




1953 :

Watson
·

and Crick

-


Build double helix model

Win Nobel Prize
-




1960 :




Watson Crick
·


and

-


A =T ; ) = G theory
-


DNA can replicate itself



1961 :
·
Crick and Brener

-


Genetic Proof of codon

Codons store
genetic into Protein Synthesis
-




X NA _ _
Structure-
Base always attaches to
sugar
·

Twisted double helio -
-

Outer Strands :
·




s
Sugar phosphate =
·


+




bonds
Strong
-




P
·




Nitrogenous base :




Weak
hydrogen bonds
-

Link to molecule
sugar
. . . . . . . . . . . .




·

Bases differ
" ·

Adenine always bonds ---------
with
hydrogen
double

· !
A =T A u Cytosine bonds with triple hydrogen
-
I
; =

----------------------
- = G




Purines
·




-


Guanine and adenine


Two fased
-




rings


Pyrimidines
·




Thymine Cytosine uracil
-




, ,
and