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Starch, Glycogen and Cellulose
• To be able to relate the structure and function of the carbohydrates starch, glycogena dncellulose
Polysaccharides…
Glycogen
Starch Vs Glycogen…
Cellulose Hydrogen Bonding
Relating Structure to Function
1. Glucose – OH groups make it water soluble, easily coverted to pyruvate in glycolysis
2. Starch (amylose) – easily broken down into glucose, linear structure allows for close packing, hence good energy store
3. Glycogen – several branches of the carbohydrate can be cut off at once to supply energy quickly
4. Cellulose – hydroxyl groups form hydrogen bonds with neighbouring chains, holding the chains firmly together forming microfibrils with high tensile strength
Summary (P13-15)…Carbohydrate Type of
moleculeComponent monomers
Structure Function andlocation
Glucose Monomer α or ß glucose Linear or ring Aerobicrespiration, bloodstream
Test next lesson…
• Be able to draw both glucose isomers
• Be able to show a glycosidic bond
• Be able to show hydrolysis and condensationreactions
1) Choose colours for C, H , O
• Make 2 molecules of alpha glucose
• Join together by a glycosidic bond
• Join a 3rd alpha glucose to make AMYLOSE
Modelling carbohydrates…
• Select a colour for C, H, O
• Use grey plastic attachments to show bonds
1. Make a molecule of α and ß glucose
2. Make a molecule of maltose with a 1,4-glycosidic bond
3. Make a 1,4 glycosidic bond between 2 molecules of ß glucose
Draw each structure on paper next to your model
Specification Points