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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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September 4, 2023
Number of pages
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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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A* A-level Comprehensive Revision Notes

Hi! I am a medical student at the University of Liverpool, selling my A* A-level Revision notes for Biology (possibly more subjects to follow). My notes are made using the specification as well as classroom learning and my own research to ensure nothing was ever missed. Happy Studying!

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