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AQA A-Level Biology
Biological Molecules
Lipids
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Triglycerides are made up of
1
Glycerol
and
3
Fatty Acids
Triglycerides are formed with
Ester
bonds, and release
3H2O
Saturated Triglycerides only have
single
bonds
Unsaturated Triglycerides have atleast
1 double
carbon bond
Fatty Acids are made up of a
carboxyl
group
and a
hydrocarbon
chain
Triglycerides are
energy
stores
due to
C-H
bonds ratio
Triglycerides are a
metabolic
water
source
due to the release of
H2O
when oxidised
Triglycerides do not affect
water
potential
due to them being
hydrophobic
, insoluble
Triglycerides have a
low
mass meaning they can store
lots
without increasing mass, preventing
movement
Phospholipids are formed with
1
Glycerol
,
2
Fatty Acids
and
1
Phosphate
Group
Phosphates have a
hydrophillic
head due to the
negative
charge
attracting water and repelling
fatty acids
Phospholipds have a
hydrophobic
tail that mixes with
fats
Phospholipids have
2
charged regions making them
polar
molecules
Phospholipids are used in creating
membrane
structure