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Summary LifeSciences Paper 2 (AFRIKAANS)

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Lewenswetenskappe Graad 12 Notas Hierdie notas gee vinnige inligting oor wat in vraestel 2 voorkom.

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1


LEWENSWETENSKAPPE


Vraestel 2

DNS - DIE KODE VAN DIE LEWE

SLEUTELBEGRIPPE

 DNS - Deoksiribosenukleiensuur
 Vier stikstofbasise
 Adenien
 Timien
 Guanien
 Sitosien
 Nukleêre DNS - in die nukleus (kern) aangetref
word
 Oorerflike - genetiese inligting wat vanaf die ouer
na die nakomeling oorgedra word

UITKENNING

 Dubbelstring
 Besit timien in plaas van urasiel
 A verbind met T
 G verbind met C/S

LIGGING

 Kern
 Mitochondria
 Chlorplaste [PLANTE]

, 2


NUKLEUS EN DIE SEL




GESKIEDENIS VAN DNS

1952 - Rosalind Franklin en Maurice wilkins ondersoek
struktuur van DNS deur x-straal
1953 - Doen onafhanklike ondersoek oor DNS, Nadat hulle
Franklin se beelde gesien het, stel hulle ‘n 3-D
dubbele heliks model vir DNS voor
1962 - Watson en Crick ontavng nobel prys vir ontdekking
van struktuur. Wilkins ontvang ‘n prys vir sy X-
straal fotografie. Franklin is oorlede aan kanker



RNS

SLEUTELEGRIPPE
 Ribosenukleiensuur
 Vier stikstofbasisse
 Adenien
 Urasiel
 Guanien
 Sitosien

, 3


UITKENNING
 Enekelstring
 Besit urasiel in plaas van timien
 A verbind met U
 G verbind met C/S

ROL VAN RNS

Drie soorte RNS belangrik vir proteiensintese met
elkeen wat n unike rol speel

LIGGING
 Nukleus
 Ribosome
 Sitoplasma

DNS PROFILERING

GEBRUIKE

 Misdadigers te identifiseer
 Vader en moederskap te bewys
 Oorsake van genetiese afwykings te bepaal
 Verenigbaarheid van weefseltipes te bepaal
 Naasbestaanders te identifiseer

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