Interview
IB Biology HL topic 7
- Vak
- Instelling
- Boek
IB biology notes for higher level topic 7
[Meer zien]Voorbeeld 3 van de 24 pagina's
Voorbeeld 3 van de 24 pagina's
In winkelwagen
In winkelwagen
gesponsord bericht van onze partner
Gekoppeld boek
Titel boek:
Auteur(s):
- Uitgave:
- ISBN:
- Druk:
Meer samenvattingen voor studieboek
-
Summary document of Chapter 5 Evolution and biodiversity IB Biology
-
IB Biology Full Course Notes + Required Drawings Units 1 - 11 & Option D
-
IB Human Physiology Option D - Biology HL & SL Notes for IBDP
Verkoper
Volgen
arathi3000
Voorbeeld van de inhoud
-•É¥:•Y&?→e.¥•÷¥E.•§f %o%QEq§aE•FIÉYE•e¥-Fq• fa•g¥ago .FI
☒•¥÷ ¥:☒.• E.÷I• ¥↳• • Nucleic Acids By A rathi Anand
0488
TO PICS 7 I 7 2,7 3
.
, . .
,DNA is 2M long
topic 7
Essential Idea : The structure of DNA is ideally suited to its function .
Skill :
Analysis of results of the
Hershey and chase experiment providing
evidence that DNA is the genetic material .
In the mid twentieth century , scientists were still unsure as to whether
-
DNA or protein was the genetic material of the cell .
•
Known that some viruses consisted solely of DNA and a protein coat
and could transfer their genetic material into hosts .
→ 1952 , Alfred and Martha Chase conducted
Hershey a series of
experiments to prove that DNA was the
genetic material .
•
viruses ( T2 bacteriophage) were grown in one of two
isotopic
mediums in order to radioactively
viral component
label a
specific .
viruses grown in radioactive sulfur ( 3 s s) had radiolabelled
proteins
•
( sulfur is present in proteins but not DNA ) 32 P )
.
•
viruses grown in radioactive phosphorus ( had radiolabeled
DNA (
phosphorus is present in DNA but not proteins ) .
The viruses were then allowed to infect a bacterium (E -
coli ) and the
the virus and bacteria were separated via
centrifugation .
• The larger bacteria formed a solid pallet while the smaller
viruses remained in the supernatant .
bacterial pallet was found to be radioactive when infected
The
32
by
the p viruses ( DNA ) but not the 35 S
-
viruses ( proteins ) -
.
• This demonstrated that DNA , NOT protein , was the genetic
material because DNA was transferred to the bacteria .
- -
protein part not in
of phage phage Ghosts
Application Rosalind Franklin 's
: and Maurice Wilkins ' investigation of DN
ray diffraction
structure by X -
.
Rosalind Franklin and Maurice Wilkins used a method of X -
ray
diffraction to investigate the structure of DNA .
, DNA was
purified and then fibres were stretched thin glass tube
•
in a
(to make most of the strands parallel )
•
The DNA was targeted by a X -
ray beam , which was diffracted
when it contacted an atom .
The scattering pattern ray was recorded
of the X film and
• -
on a
used to elucidate details of molecular structure .
Summary of the Process of X-Ray Crystallography
From the
scattering pattern
produced by a DNA molecule ,
certain inferences could be
made about its structure .
•
COMPOSITION :
DNA is a
double stranded molecule
• ORIENTATION : Nitrogenous
bases are closely packed together on the inside and phosphates
form an outer backbone .
• SHAPE ! The DNA molecule twists at regular intervals (every 34
Ang storm ) to form a helix ( two strands = double helix .
Franklin 's data shared by Wilkins with James Watson ( without
was
Franklin 's permission ) who , with the help of Francis Crick , used
the information to create a molecular model of the basic structu
of DNA .
→ In 1962 , Watson , Crick and Wilkins ( but not Franklin ) were awarde
Nobel prize .
understanding : DNA structure
suggested a mechanism for DNA
replication .
FrankKin 's X ray diffraction experiments demonstrated that the DNA
-
helix is both tightly packed and regular in structure .
•
Phosphates ( and sugars ) form the outer backbone and nitrogenous
within the interior
bases are packaged .
Chargaff demonstrated that DNA is composed of an equal numbe
of purines ( At a) and (CtT) pyrimidines .
Voordelen van het kopen van samenvattingen bij Stuvia op een rij:
Verzekerd van kwaliteit door reviews
Stuvia-klanten hebben meer dan 700.000 samenvattingen beoordeeld. Zo weet je zeker dat je de beste documenten koopt!
Snel en makkelijk kopen
Je betaalt supersnel en eenmalig met iDeal, creditcard of Stuvia-tegoed voor de samenvatting. Zonder lidmaatschap.
Focus op de essentie
Samenvattingen worden geschreven voor en door anderen. Daarom zijn de samenvattingen altijd betrouwbaar en actueel. Zo kom je snel tot de kern!
Veelgestelde vragen
Wat krijg ik als ik dit document koop?
Je krijgt een PDF, die direct beschikbaar is na je aankoop. Het gekochte document is altijd, overal en oneindig toegankelijk via je profiel.
Tevredenheidsgarantie: hoe werkt dat?
Onze tevredenheidsgarantie zorgt ervoor dat je altijd een studiedocument vindt dat goed bij je past. Je vult een formulier in en onze klantenservice regelt de rest.
Van wie koop ik deze samenvatting?
Stuvia is een marktplaats, je koop dit document dus niet van ons, maar van verkoper arathi3000. Stuvia faciliteert de betaling aan de verkoper.
Zit ik meteen vast aan een abonnement?
Nee, je koopt alleen deze samenvatting voor €7,34. Je zit daarna nergens aan vast.
Is Stuvia te vertrouwen?
4,6 sterren op Google & Trustpilot (+1000 reviews)
Afgelopen 30 dagen zijn er 67163 samenvattingen verkocht
Opgericht in 2010, al 14 jaar dé plek om samenvattingen te kopen