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Summary IEB Grade 12: DNA code of life

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Handwritten summary life science notes which corresponds with the IEB syllabus. Summary from the mind action series textbook.

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Dna code of life
Uploaded on
November 29, 2021
Number of pages
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Written in
2021/2022
Type
Summary

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, nucleic and





" " "

of life
"
molecules most molecules earth
or
extraordinary on




stores information that controls cellular & development of
activity entire
organism
-
an




( as
by controlling synthesis of proteins Riba nucleic
Deoscyribo nucleic acid acid


( DNA ) (RNA)




enzymes of proteins that control chemical processes




* It the &
controls structure
functioning of all
living organisms




D-- -
ymit-tn-vtc.no acted


DNA
discovery
-
most important biological work
of the last 100
years


Discovery of
the structure



1 Maurice & Franklin , at 1950 's
Wilkins Rosalind
Kings College in London ,
early
there was
diffraction images of DNA
① phosphate group
experimental approach ( )
they took x
ray crystallography

an -




base
nitrogenous
2 Francis Crick
( student)
& James Watson
( researcher)
,
at Cavendish Institute at
Cambridge university /
graduate

Rosalind Franklin
they analysed the data collected
by and others

x
ray
-




pentose sugar


they built a model out of brass plates , clamps and other bits




realised nucleic is like twisted ladder
: acid
arranged a





two runners phosphate & series
of rungs pair of organic compounds ( bases)
sugars
= =
,




Discovery of replication

Watson & Crick had
" "

an ar ticle called Nature




(ART) CC8 G)
pairing of
-

bases




there is a
sequences of bases on both strands
-




-
as the two strands separated it served as a
template for a
complementary new chain ( the strand would replicate)


Brenner ( 1961) ,
-
Fran is Crick &
Sydney provided genetic proof : that triple code was used in
reading genetic material in DNA




information was
transferred from the nucleus to the
cytoplasm via RNA



DNA could produce exact copies of itself and
carry genetic
instructions




bases in DNA form a code which
genetic information can be stored and transmitted




Nobel Prize



James Watson , Fran is Crick & Maurice Wilkins the Nobel Prize for physiology / medicine in ( Rosalind Franklin of radiation )
won 1962 died ovarian cancer
possibly due to exposure at
age 37





Nobel Prizes be awarded to
only :

can




living recipients



shared 3 winners
among
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