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Summary Biological molecules

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These notes cover the biological molecules section of the Edexcel igcse biology syllabus.

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Carbohydrates proteins Lipids are large molecules madeup from
smaller base units




CARBOHYDRATES I PROTEINS I
from simple
sugars
amino acids p.tt
Starch Glycogen are made Proteins are madefrom lipids are madefrom Yayora
Stai'bÉFÉYgé Hydrogen I carbon oxygen Hydrogen Nitrogen Carbon oxygen hydrogen
somenusmallantsof
otherelements

I exsulphur
I
I
1
I
1
I
Y
lots of energy releasedfrom glucose molecules when bonds are broken
between carbon atomsduring respiration
disaccharide 2 ormore monosaccharides joined
together
maltose 2 glucosemolecules
Sucrose a glucose I fructose
Polysaccharide lots
starch
glycogen
cellulose
insoluble useful as
storage molecules
made up of triglycerides v
basic unit one glycerolmolecule
bonded to 3 Ettyacidchains
chemically
Divided into fats Oils
d
liquid
varyinsize structure
solid at room
temp

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Biological molecules
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Written in
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