Bio-Unit 1.1:Polysaccharides
Feature | Starch | Glycogen | Cellulose |
|---|---|---|---|
Glucose monomer | alpha | alpha | beta |
Shape of molecules | -glycosidic bonds from condensation reactions-unbranched chains-tight coils | -glycosidic bonds from condensation reactions-branched | -glycosidic bonds from condensation reactions |
Found in animals or plants | plants | animals | plants (cell wall) |
Function | energy storage | energy storage | structural |
Adaptations to function | -insoluble: no effect of osmosis-compact: can fit a lot into a small space-large and insoluble: doesn’t diffuse out of cell | -insoluble: no effect of osmosis-compact: can fit a lot into a small space-branched: many ends for enzymes to start hydrolysis reactions-large and insoluble: doesn’t diffuse out of cell | - strong: unbranched chains linked together by H bonds + microfibrils join together to form fibres i |
Food test | iodine solution+: orange>blue/black |