Starch and Cellulose
- Created by: hannah
- Created on: 23-04-13 17:59
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- Cellulose and Starch
- Starch
- Made of chains of alpha glucose monosaccharides
- alpha glucose molecules linkedby glycosidic bonds
- glycosidic bonds madein condensation reactions
- unbranchedchain wound into a tight coil to make a compact molecule
- it is compact so is can be stored in a small space
- it is insoluable
- doesn't draw water into cells by osmosis
- when hydrolyed it forms alpha glucose
- alpha glucose is easily transported and readily used in respiration
- Cellulose
- made from monomers of beta glucose
- made of straight unbranched chains
- placed parallel to eachother .
- hydrogen bonds form, making cross-linkages between adjacent molecules
- hydrogen bonds icrease strength of the cellulose
- makes it a good structural materialin plant cell walls
- also good in a plan cell wall because it prevents the cell from bursting as water enters by exerting an inward pressure that stops further influx of water
- makes it a good structural materialin plant cell walls
- hydrogen bonds icrease strength of the cellulose
- hydrogen bonds form, making cross-linkages between adjacent molecules
- placed parallel to eachother .
- cellulose molecules group togeher to form microfibrils
- microfibrils arranged in parralel groups to form fibres
- Starch
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