Summary
Summary Topic 2 DNA Structure
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Edexcel Biology Topic 2 DNA Structure, DNA Bases, Double Helix.
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DNA StructureBonds
.
formed
Carbon =
4
DNA-deoxyribonucleic acid ;
long chain
polymer made
of single repeating units
(mono) which bonded
called nucleotides are
together
.
Oxygen = 2 ↳ DNA is a
polynucleotide
HydrogenS.I unitsA =
Nitrogen = 3
Mononucleotides *
Phosphate
group
Nucleoside =
Sugart base
* organic
(nitrogenous
L buse
T
LEdeoxyribose
-
glycosise
Phosphoester bona
.
e
g
Jadenine)
.
Adenosine monophosphatee
↑
e 2)
.
g
.
↑
A 3 Adenosine triphosphate
=
ATP
Bases Nucleotides are not identical but similar
. This is because
different nitrogenous
bonds together
bases .
--
Purines double ning structures
-
Cy
I rimidines -
Single ring
structures
Adenine =
A -
Ademine -
Thymine
Thymine T Guanine Cytosine
= - -
Guanine =
G
Cytosine =
C
A bonds to T
↳ bonds to C
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