1. Starch, glycogen, and cellulose are polysaccharides made of glucose monomers that differ in their structure and function. 2. Starch has a linear structure that allows for close packing, making it a good energy store that can be easily broken down into glucose. 3. Glycogen branches, allowing several branches to be cut off at once to quickly supply energy. 4. Cellulose has hydroxyl groups that form hydrogen bonds between chains, holding them firmly together into strong microfibrils.

1. Starch, Glycogen and Cellulose
• To be able to relate the structure and function
of the carbohydrates starch, glycogena dn
cellulose

4. Polysaccharides…

6. Glycogen

7. Starch Vs Glycogen…

8. Cellulose Hydrogen Bonding

9. 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

10. Summary (P13-15)…
Carbohydrate Type of
molecule
Component
monomers
Structure Function
and
location
Glucose Monomer α or ß glucose Linear or ring Aerobic
respiration,
bloodstream

11. Test next lesson…
• Be able to draw both glucose isomers
• Be able to show a glycosidic bond
• Be able to show hydrolysis and condensation
reactions

12. 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

13. 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

14. Specification Points