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Biology OCR A-Level Biological Molecules Summary

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A Handwritten Summary of all A* content needed for the Biological Molecules unit of A-Level OCR Biology.

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*
Water
:

H- -H ,
forms polar hydrogen bonds
High boiling cohesive Solvent Stable
·




point
·




>
Less dense as a Solid Adhesive Coolant Capillary action
-




Carbohydrates :

Saccharides made of
only Carbon ,


CH 28H,
hydrogen and oxygen
GH28H
Glucose hexose monosaccharide B Glucose -
OH
-
: -




W↓
Glucose :
·

↓ W :

Ad
' -
~br
~
I ridH I~
dr dr
condensation Reaction :
GH28H GH28H
-~
-




-~ -


i
CH20H CH20H W -
GH28H GH28H br
H
-
rid o rid i
S
0 ↑ S
O
+ H20
- -




GH28H
-~Wbr X- -
F~
-




" X-qH~
W W - 0
CH2
joh
I
+
I
I
I
1 qH- - + H20 ↓H ↓H
rid-
A
I S

ridH 9
-

-~dr
-

S
W
rid
o
0H
~br

· S H
I
o glycosidic bond
HO I S H
di rid o
I
S
1,6
I



↓H ↓H I
I
;
I
,
↓H ↓H
& Glucose +
↓ Glucose 1,
4-Glycosidic bond

Starch Chemical
·




energy store of glucose
:




Amylose Straight :
chain helix of 1 ,4
glycosidic bonds :

Compact ,
insoluble
>

Amylopectin 1 ,4
glycosidic bond glucose chain with branches joined by bonds
:


,



·Glycogen :

more
heavilybranched than
amylopectin so is more compact
Cellulose :

B
glucose polysaccharide -> cannot coil or branch

↳ make
hydrogen bonds with eachother creating microfibrils which form macrofibrics

Very strong and insoluble

alycerol fatty acids


Lipids
" "
3
P
fats and oils
--OH
Ho-c-cHa
made of Carbon hydrogen and oxygen
:


,
, o
HO- " -
cH3 ->
t


Triglycerides HO-c-cH3
or
and three
glycerol
- u



One
fatty acids
· :




-

Saturated Noc=cbonds :




unsaturated :
Causes the chain to bend .
->
Cant
pacu together
CH 200

Phospholipid head
·
Coo
< hydrophilic phosphate hydrophobic fattyacid tails
:
no
- ,




Sterols 4
·


Carbon
hydrophilic/hydrophobic interactions
ring complex alcohols with
:




↳ Cholesterol
regulates membrane fluidity
ie .




·

Roles of lipids membrane formation Hormone production Electrical insulation
: · ·




Thermal insulation
Cushioning/protection buoyancy
·

. .

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Type
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Handwritten A-Level notes by an Oxford University Medical Student that specifically target the content needed for an A-A*.

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