Summary Topic 2 DNA Structure

DNA Structure
Bonds
.




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