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Summary AQA A-level Biology: Biological Molecules Revision Notes

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These are full comprehensive notes on the entire Module of Biological Molecules for the AQA A-level specification. They are written using a mixture of my own research, class learning and the specification. They include diagrams, step by steps and everything I needed to get an A* in A-level Biology.

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, Organic molecules contain carbon




1 monosaccharide 2=di 3
carbohydrate
= +
poly
=




monosaccharides a re
joined by condensation reac tions .



Polysaccharides a re broken down
by hydrolysis


monosaccharides 8 disaccharides 8




* *
glucose maltose =
glucose +
glucose


*
fructose CGHI206 isomers .
* lac tose =
glucose +
galactose 921-1220 ,, isomers .




*
galactose * s u cros e =
glucose
+ fructose



carbohydrate means made up of carbon , hydrogen and oxygen .




monosaccharides are soluble




hÑe the ability to form H bonds with water




disaccharides aren't soluble and cannot be absorbed .




monosaccharides form glycosidic bonds .




Alpha Glucose : Condensation Reaction for alpha glucose
8

C 1-1201-1


H C ① H CHIH CHIH

H C O H H C O H

"
"
C
t) [ c [
OH H OH 1-1



[ [ HO C C OH HO C C OH

OH
OH
H
1-1 1-120
H OH




1-1 0 C C 0/-1
"KOH
a-KOH



H C 0 H H C 0 H

" H


H OH C c , c
OH H OH
+1



HO C C 0 C C OH

1-1 OH 1-1 01-1




Polysaccharides .




Type Amylose Amylopectin Cellulose Glycogen


Glycosidic bond ✗ 1 :
4 ✗ 1 4
:
and ✗ I :b Bl :
4 ✗ 1 :4 and ✗ I :b


long unbranched chair
coined into a helix

overall shape branched chairs long straight ,
chairs very branched chains




hydrogen bonds within within between within -




Solubility (water) insoluble Insoluble Insoluble insoluble




-
Formed From alpha glucose alpha glucose beta glucose alpha glucose




Function storage in plant cells .

Storage in plant cells . struc tural a i d in plant cells .



storage in animal liver and




hydrolysis produces glucose hydrolysis produces glucose used to form cell walls muscle cells




Hydrolysis produces glucose .




How structure compact so a lot can be stored branched with Mary ends so l o ts of cellulose has high tensile strength highly branched so
many ends




relates to function in a s m all space .


glucose can b e released .
so prevents lysis .
means lots of glucose released .




Insoluble so no osmotic effect Insoluble so no osmotic effect Insoluble so no osmotic effect Insoluble so no osmotic effect


on water potential of cell .
on water potential of cell .
on water potential of cell .

on water potential of cell .

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