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2903023
Carbohydrates
Descripción
CCEA AS Biology - Molecules of Life (disaccharides and polysaccharides)
Sin etiquetas
biology
as level
Mapa Mental por
lmcg7
, actualizado hace más de 1 año
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lmcg7
hace alrededor de 9 años
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Resumen del Recurso
Carbohydrates
Disaccharides
Double unit sugars
Formed when 2 monosaccharides react during condensation (loss of water molecule)
Broken down into constituent monomers during hydrolysis breaking glycosidic bond
Maltose - 2 a-glucose molecules via condesation
Sucrose - a-glucose condenses with fructose
Polysaccharides
Complex sugars which form long chains of many monomers
Formed through condensation joining of monomers to polymers - NOT sugars (not sweet / insoluble) so used for storage
STARCH - a-glucose
Amylose
a-1,4 glycosidic bonds - unbranched chain. Due to bulky side groups, a-glucose molecules lie at angles so chains coil into a helix
Amylopectin
a-1,4 and a-1,6 glycosidic bonds - branched chains. Branches form a multihelical shape
Very compact / insoluble / easily hydrolysed
GLYCOGEN - a-glucose
a-1,4 and a-1,6 glycosidic bonds - branched. More highly branched / shorter than amylopectin
Compact / insoluble / more easily hydrolysed
CELLULOSE - B-glucose
Structural polymer of B-glucose monomers - alternate B-1,4 link molecules are rotated through 180 - straight chain
High tensile strength // insoluble // hard to digest
H-bonds form cross-linkages with adjacent chains, chains grouped in microfibrils
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