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Summary AQA A-Level Biology – Biological Molecules (Unit 1) – Complete Revision Notes

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These notes cover AQA A-Level Biology topic “Biological Molecules,” including carbohydrates, lipids, proteins, enzymes, nucleic acids (DNA and RNA), ATP, and food tests. The document explains structure, bonding, biological function, enzyme action, enzyme inhibition, and energy transfer processes in detail. It is organised as comprehensive revision material aligned with the AQA specification and ideal for exam preparation.

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, carbohydrates
Keywords monosaccharides
Monosaccharides individual sugar monomers
that make disaccharides &
polysaccharides
Disaccharides4 glucose galactose fructose-eesugar,
, ,
(6 carbon atoms)
Polysaccharides
glucose
:
somers
i of
a
glucose alpha-glucose beta glucose
b-glucose
galactose Hydroxyl
fructose
maltose
lactose Hydrogen
sucrose

amylose disaccharides joined in a condensation reaction

amylopectin
-




Maltose-glucose t glucose -

reducing Reducing Sugar can be used as reducing agent
starch
-

Lactose glucose galactose
= T
reducing
X (can donate electrons)
Sucrose- glugset fructose
glycogen non-reducing
-




cellulose
maltose a
glucose
Glycosidic bond
Hydrogenbond
#
-
Glycosidic


S
Bond




V

polysaccharides two or more monosaccharides in a condensation reaction , can be broken down by hydrolysis
starch from two polysaccharides
a
glucose ;
·
amylose long ,
unbranched shape compact
forms
coil I
more



& stores smaller space ; 1 Y Glycosidic
more in
bonds

amylopectin long branched chains high SA for enzymes
· -

,




to hydrolyse easily glucose released quickly for
,
so



respiration ; I-6 bonds
store plantsfor

in excess
glucose as insoluble

(toolage to leave cell) -
does not affect water potential


glycogen from a
glucose , long ,
branched chains with lots
bonds
of
side
branches I
increased SA for enzymes
to hydrolyse allowing glucose to be
,


released quickly & compact molewle so good for storage , IG bond

store in animals for exces glucose in muscles & liver



&
cellulose
from B-glucose; long unbranched straight chains w/chains linked
, ,


each molente together by Hydogen bands to form thicker gbres called
1800 in alternating
pattern microfibrils very strong but still flexible allowing them to provide support
-

,




↑ d4d4d & allow cells to become turgid , I b bonds
major structural component cell walls plants

in
of

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